25661962051 has 6 divisors (see below), whose sum is σ = 28206950156. Its totient is φ = 23329056300.

The previous prime is 25661961953. The next prime is 25661962069. The reversal of 25661962051 is 15026916652.

It is not a de Polignac number, because 25661962051 - 2⁹ = 25661961539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25661961989 and 25661962007.

It is not an unprimeable number, because it can be changed into a prime (25661962351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106041045 + ... + 106041286.

Almost surely, 2^25661962051 is an apocalyptic number.

25661962051 is a deficient number, since it is larger than the sum of its proper divisors (2544988105).

25661962051 is a wasteful number, since it uses less digits than its factorization.

25661962051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212082353 (or 212082342 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 25661962051 in words is "twenty-five billion, six hundred sixty-one million, nine hundred sixty-two thousand, fifty-one".