25637621051 has 4 divisors (see below), whose sum is σ = 29300138352. Its totient is φ = 21975103752.

The previous prime is 25637621041. The next prime is 25637621057. The reversal of 25637621051 is 15012673652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-25637621051 is a prime.

It is a super-2 number, since 2×25637621051² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25637620996 and 25637621014.

It is not an unprimeable number, because it can be changed into a prime (25637621057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831258640 + ... + 1831258653.

It is an arithmetic number, because the mean of its divisors is an integer number (7325034588).

Almost surely, 2^25637621051 is an apocalyptic number.

25637621051 is a deficient number, since it is larger than the sum of its proper divisors (3662517301).

25637621051 is an equidigital number, since it uses as much as digits as its factorization.

25637621051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662517300.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 25637621051 in words is "twenty-five billion, six hundred thirty-seven million, six hundred twenty-one thousand, fifty-one".