256255202694840 has 32 divisors (see below), whose sum is σ = 768765608084880. Its totient is φ = 68334720718592.

The previous prime is 256255202694763. The next prime is 256255202694851. The reversal of 256255202694840 is 48496202552652.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1067730011109 + ... + 1067730011348.

Almost surely, 2^{256255202694840} is an apocalyptic number.

256255202694840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256255202694840 is an abundant number, since it is smaller than the sum of its proper divisors (512510405390040).

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

256255202694840 is a wasteful number, since it uses less digits than its factorization.

256255202694840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135460022471 (or 2135460022467 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 60.

The spelling of 256255202694840 in words is "two hundred fifty-six trillion, two hundred fifty-five billion, two hundred two million, six hundred ninety-four thousand, eight hundred forty".