655495395840 has 240 divisors, whose sum is σ = 2279682662400. Its totient is φ = 174065934336.

The previous prime is 655495395833. The next prime is 655495395859. The reversal of 655495395840 is 48593594556.

655495395840 is a `hidden beast` number, since 6 + 5 + 5 + 4 + 9 + 539 + 58 + 40 = 666.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5447041 + ... + 5566079.

It is an arithmetic number, because the mean of its divisors is an integer number (9498677760).

Almost surely, 2^655495395840 is an apocalyptic number.

655495395840 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 655495395840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139841331200).

655495395840 is an abundant number, since it is smaller than the sum of its proper divisors (1624187266560).

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

655495395840 is a wasteful number, since it uses less digits than its factorization.

655495395840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119307 (or 119288 counting only the distinct ones).

The product of its (nonzero) digits is 116640000, while the sum is 63.

The spelling of 655495395840 in words is "six hundred fifty-five billion, four hundred ninety-five million, three hundred ninety-five thousand, eight hundred forty".