256734145452680 has 64 divisors (see below), whose sum is σ = 699007253178240. Its totient is φ = 82845304077312.

The previous prime is 256734145452679. The next prime is 256734145452683. The reversal of 256734145452680 is 86254541437652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (256734145452683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26967867662 + ... + 26967877181.

It is an arithmetic number, because the mean of its divisors is an integer number (10921988330910).

Almost surely, 2^{256734145452680} is an apocalyptic number.

256734145452680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256734145452680 is an abundant number, since it is smaller than the sum of its proper divisors (442273107725560).

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

256734145452680 is a wasteful number, since it uses less digits than its factorization.

256734145452680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53935744878 (or 53935744874 counting only the distinct ones).

The product of its (nonzero) digits is 193536000, while the sum is 62.

The spelling of 256734145452680 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred forty-five million, four hundred fifty-two thousand, six hundred eighty".