256727567604647 has 16 divisors (see below), whose sum is σ = 262734608378880. Its totient is φ = 250763780467200.

The previous prime is 256727567604611. The next prime is 256727567604659. The reversal of 256727567604647 is 746406765727652.

It is a cyclic number.

It is not a de Polignac number, because 256727567604647 - 2¹⁶ = 256727567539111 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 (256727567601647) 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, 152953247 + ... + 154622607.

It is an arithmetic number, because the mean of its divisors is an integer number (16420913023680).

Almost surely, 2^{256727567604647} is an apocalyptic number.

256727567604647 is a deficient number, since it is larger than the sum of its proper divisors (6007040774233).

256727567604647 is a wasteful number, since it uses less digits than its factorization.

256727567604647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682314.

The product of its (nonzero) digits is 4978713600, while the sum is 74.

The spelling of 256727567604647 in words is "two hundred fifty-six trillion, seven hundred twenty-seven billion, five hundred sixty-seven million, six hundred four thousand, six hundred forty-seven".