256512265520 has 80 divisors (see below), whose sum is σ = 698213936448. Its totient is φ = 85802004480.

The previous prime is 256512265463. The next prime is 256512265547. The reversal of 256512265520 is 25562215652.

256512265520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5563109 + ... + 5609028.

Almost surely, 2^256512265520 is an apocalyptic number.

256512265520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256512265520 is an abundant number, since it is smaller than the sum of its proper divisors (441701670928).

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

256512265520 is a wasteful number, since it uses less digits than its factorization.

256512265520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172198 (or 11172192 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 256512265520 in words is "two hundred fifty-six billion, five hundred twelve million, two hundred sixty-five thousand, five hundred twenty".