25440655604451 has 32 divisors (see below), whose sum is σ = 37159261286400. Its totient is φ = 15412647306240.

The previous prime is 25440655604443. The next prime is 25440655604479. The reversal of 25440655604451 is 15440655604452.

It is not a de Polignac number, because 25440655604451 - 2³ = 25440655604443 is a prime.

It is a super-2 number, since 2×25440655604451² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 25440655604394 and 25440655604403.

It is not an unprimeable number, because it can be changed into a prime (25440655604951) 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, 17633386 + ... + 19021503.

It is an arithmetic number, because the mean of its divisors is an integer number (1161226915200).

Almost surely, 2^{25440655604451} is an apocalyptic number.

25440655604451 is a deficient number, since it is larger than the sum of its proper divisors (11718605681949).

25440655604451 is a wasteful number, since it uses less digits than its factorization.

25440655604451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36655379.

The product of its (nonzero) digits is 11520000, while the sum is 51.

Subtracting from 25440655604451 its reverse (15440655604452), we obtain a palindrome (9999999999999).

The spelling of 25440655604451 in words is "twenty-five trillion, four hundred forty billion, six hundred fifty-five million, six hundred four thousand, four hundred fifty-one".