256130340661 has 16 divisors (see below), whose sum is σ = 282449462400. Its totient is φ = 230801313600.

The previous prime is 256130340649. The next prime is 256130340671. The reversal of 256130340661 is 166043031652.

It is not a de Polignac number, because 256130340661 - 2³¹ = 253982857013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256130340661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256130340601) 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, 796915 + ... + 1071136.

It is an arithmetic number, because the mean of its divisors is an integer number (17653091400).

Almost surely, 2^256130340661 is an apocalyptic number.

It is an amenable number.

256130340661 is a deficient number, since it is larger than the sum of its proper divisors (26319121739).

256130340661 is a wasteful number, since it uses less digits than its factorization.

256130340661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868316.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 256130340661 in words is "two hundred fifty-six billion, one hundred thirty million, three hundred forty thousand, six hundred sixty-one".