25920663551 has 4 divisors (see below), whose sum is σ = 26124763392. Its totient is φ = 25716563712.

The previous prime is 25920663523. The next prime is 25920663553. The reversal of 25920663551 is 15536602952.

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

It is a cyclic number.

It is not a de Polignac number, because 25920663551 - 2²⁶ = 25853554687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25920663553) 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, 102049730 + ... + 102049983.

It is an arithmetic number, because the mean of its divisors is an integer number (6531190848).

Almost surely, 2^25920663551 is an apocalyptic number.

25920663551 is a deficient number, since it is larger than the sum of its proper divisors (204099841).

25920663551 is a wasteful number, since it uses less digits than its factorization.

25920663551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204099840.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 25920663551 in words is "twenty-five billion, nine hundred twenty million, six hundred sixty-three thousand, five hundred fifty-one".