656373491280 has 240 divisors, whose sum is σ = 2387005669776. Its totient is φ = 160675799040.

The previous prime is 656373491261. The next prime is 656373491287. The reversal of 656373491280 is 82194373656.

656373491280 is a `hidden beast` number, since 6 + 5 + 6 + 3 + 73 + 491 + 2 + 80 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 93981486096 + 562392005184 = 306564^2 + 749928^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656373491287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1500444 + ... + 1887876.

It is a 2-persistent number, because it is pandigital, and so is 2⋅656373491280 = 1312746982560, but 3⋅656373491280 = 1969120473840 is not.

Almost surely, 2^656373491280 is an apocalyptic number.

656373491280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656373491280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193502834888).

656373491280 is an abundant number, since it is smaller than the sum of its proper divisors (1730632178496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656373491280 is a wasteful number, since it uses less digits than its factorization.

656373491280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387646 (or 387637 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 656373491280 in words is "six hundred fifty-six billion, three hundred seventy-three million, four hundred ninety-one thousand, two hundred eighty".