25640611521553 has 32 divisors (see below), whose sum is σ = 29996763291648. Its totient is φ = 21463642267200.

The previous prime is 25640611521529. The next prime is 25640611521601. The reversal of 25640611521553 is 35512511604652.

It is a happy number.

It is not a de Polignac number, because 25640611521553 - 2⁵ = 25640611521521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640611521523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1015014943 + ... + 1015040203.

It is an arithmetic number, because the mean of its divisors is an integer number (937398852864).

Almost surely, 2^{25640611521553} is an apocalyptic number.

It is an amenable number.

25640611521553 is a deficient number, since it is larger than the sum of its proper divisors (4356151770095).

25640611521553 is a wasteful number, since it uses less digits than its factorization.

25640611521553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44533.

The product of its (nonzero) digits is 1080000, while the sum is 46.

The spelling of 25640611521553 in words is "twenty-five trillion, six hundred forty billion, six hundred eleven million, five hundred twenty-one thousand, five hundred fifty-three".