256912057487 has 4 divisors (see below), whose sum is σ = 257153744400. Its totient is φ = 256670370576.

The previous prime is 256912057429. The next prime is 256912057517. The reversal of 256912057487 is 784750219652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256912057487 - 2⁸ = 256912057231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256912057417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120841862 + ... + 120843987.

It is an arithmetic number, because the mean of its divisors is an integer number (64288436100).

Almost surely, 2^256912057487 is an apocalyptic number.

256912057487 is a deficient number, since it is larger than the sum of its proper divisors (241686913).

256912057487 is a wasteful number, since it uses less digits than its factorization.

256912057487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241686912.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 256912057487 in words is "two hundred fifty-six billion, nine hundred twelve million, fifty-seven thousand, four hundred eighty-seven".