256724677545131 has 4 divisors (see below), whose sum is σ = 256725097042512. Its totient is φ = 256724258047752.

The previous prime is 256724677544971. The next prime is 256724677545143. The reversal of 256724677545131 is 131545776427652.

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 256724677545131 - 2¹⁴ = 256724677528747 is a prime.

It is a super-2 number, since 2×256724677545131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256724677545331) 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, 208829375 + ... + 210055128.

It is an arithmetic number, because the mean of its divisors is an integer number (64181274260628).

Almost surely, 2^{256724677545131} is an apocalyptic number.

256724677545131 is a deficient number, since it is larger than the sum of its proper divisors (419497381).

256724677545131 is an equidigital number, since it uses as much as digits as its factorization.

256724677545131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419497380.

The product of its digits is 296352000, while the sum is 65.

The spelling of 256724677545131 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, six hundred seventy-seven million, five hundred forty-five thousand, one hundred thirty-one".