256621140156 has 48 divisors (see below), whose sum is σ = 612762796800. Its totient is φ = 83543574912.

The previous prime is 256621140137. The next prime is 256621140161. The reversal of 256621140156 is 651041126652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11304025 + ... + 11326703.

It is an arithmetic number, because the mean of its divisors is an integer number (12765891600).

Almost surely, 2^256621140156 is an apocalyptic number.

It is an amenable number.

256621140156 is an abundant number, since it is smaller than the sum of its proper divisors (356141656644).

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

256621140156 is a wasteful number, since it uses less digits than its factorization.

256621140156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44658 (or 44656 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 256621140156 in words is "two hundred fifty-six billion, six hundred twenty-one million, one hundred forty thousand, one hundred fifty-six".