25555613606613 has 48 divisors (see below), whose sum is σ = 37422729077760. Its totient is φ = 16803144137472.

The previous prime is 25555613606599. The next prime is 25555613606623. The reversal of 25555613606613 is 31660631655552.

25555613606613 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 5 + 6 + 13 + 6 + 0 + 6 + 613 = 666.

It is not a de Polignac number, because 25555613606613 - 2⁴ = 25555613606597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25555613606613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555613606623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 513583531 + ... + 513633287.

It is an arithmetic number, because the mean of its divisors is an integer number (779640189120).

Almost surely, 2^{25555613606613} is an apocalyptic number.

It is an amenable number.

25555613606613 is a deficient number, since it is larger than the sum of its proper divisors (11867115471147).

25555613606613 is a wasteful number, since it uses less digits than its factorization.

25555613606613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51458 (or 51455 counting only the distinct ones).

The product of its (nonzero) digits is 14580000, while the sum is 54.

The spelling of 25555613606613 in words is "twenty-five trillion, five hundred fifty-five billion, six hundred thirteen million, six hundred six thousand, six hundred thirteen".