256647640301 has 16 divisors (see below), whose sum is σ = 276820051200. Its totient is φ = 236536962048.

The previous prime is 256647640213. The next prime is 256647640331. The reversal of 256647640301 is 103046746652.

It is a cyclic number.

It is not a de Polignac number, because 256647640301 - 2²⁶ = 256580531437 is a prime.

It is a super-2 number, since 2×256647640301² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256647640331) 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, 36781325 + ... + 36788301.

It is an arithmetic number, because the mean of its divisors is an integer number (17301253200).

Almost surely, 2^256647640301 is an apocalyptic number.

It is an amenable number.

256647640301 is a deficient number, since it is larger than the sum of its proper divisors (20172410899).

256647640301 is a wasteful number, since it uses less digits than its factorization.

256647640301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10988.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 256647640301 in words is "two hundred fifty-six billion, six hundred forty-seven million, six hundred forty thousand, three hundred one".