256613032670121 has 12 divisors (see below), whose sum is σ = 392466991142772. Its totient is φ = 161012098930176.

The previous prime is 256613032670117. The next prime is 256613032670191. The reversal of 256613032670121 is 121076230316652.

256613032670121 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 130 + 326 + 70 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 232652056620096 + 23960976050025 = 15252936^2 + 4894995^2 .

It is not a de Polignac number, because 256613032670121 - 2² = 256613032670117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256613032670101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838604681776 + ... + 838604682081.

It is an arithmetic number, because the mean of its divisors is an integer number (32705582595231).

Almost surely, 2^{256613032670121} is an apocalyptic number.

It is an amenable number.

256613032670121 is a deficient number, since it is larger than the sum of its proper divisors (135853958472651).

256613032670121 is a wasteful number, since it uses less digits than its factorization.

256613032670121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677209363880 (or 1677209363877 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

Adding to 256613032670121 its reverse (121076230316652), we get a palindrome (377689262986773).

The spelling of 256613032670121 in words is "two hundred fifty-six trillion, six hundred thirteen billion, thirty-two million, six hundred seventy thousand, one hundred twenty-one".