656742442343240 has 96 divisors (see below), whose sum is σ = 1640297680532280. Its totient is φ = 236450924160000.

The previous prime is 656742442343209. The next prime is 656742442343243. The reversal of 656742442343240 is 42343244247656.

656742442343240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 641563610759236 + 15178831584004 = 25329106^2 + 3896002^2 .

It is not an unprimeable number, because it can be changed into a prime (656742442343243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 671246741 + ... + 672224420.

Almost surely, 2^{656742442343240} is an apocalyptic number.

It is an amenable number.

656742442343240 is an abundant number, since it is smaller than the sum of its proper divisors (983555238189040).

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

656742442343240 is a wasteful number, since it uses less digits than its factorization.

656742442343240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343471295 (or 1343471280 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 56.

The spelling of 656742442343240 in words is "six hundred fifty-six trillion, seven hundred forty-two billion, four hundred forty-two million, three hundred forty-three thousand, two hundred forty".