25566122651 has 4 divisors (see below), whose sum is σ = 25566477552. Its totient is φ = 25565767752.

The previous prime is 25566122641. The next prime is 25566122671. The reversal of 25566122651 is 15622166552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25566122651 - 2⁶ = 25566122587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25566122599 and 25566122608.

It is not an unprimeable number, because it can be changed into a prime (25566122611) 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, 26711 + ... + 227696.

It is an arithmetic number, because the mean of its divisors is an integer number (6391619388).

Almost surely, 2^25566122651 is an apocalyptic number.

25566122651 is a deficient number, since it is larger than the sum of its proper divisors (354901).

25566122651 is a wasteful number, since it uses less digits than its factorization.

25566122651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354900.

The product of its digits is 216000, while the sum is 41.

The spelling of 25566122651 in words is "twenty-five billion, five hundred sixty-six million, one hundred twenty-two thousand, six hundred fifty-one".