256743552634536 has 32 divisors (see below), whose sum is σ = 700209689004000. Its totient is φ = 77801076555840.

The previous prime is 256743552634489. The next prime is 256743552634559. The reversal of 256743552634536 is 635436255347652.

It is a Harshad number since it is a multiple of its sum of digits (66).

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 7 ways as a sum of consecutive naturals, for example, 486256728211 + ... + 486256728738.

It is an arithmetic number, because the mean of its divisors is an integer number (21881552781375).

Almost surely, 2^{256743552634536} is an apocalyptic number.

It is an amenable number.

256743552634536 is an abundant number, since it is smaller than the sum of its proper divisors (443466136369464).

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

256743552634536 is a wasteful number, since it uses less digits than its factorization.

256743552634536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972513456969 (or 972513456965 counting only the distinct ones).

The product of its digits is 1632960000, while the sum is 66.

The spelling of 256743552634536 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred fifty-two million, six hundred thirty-four thousand, five hundred thirty-six".