25565932771 has 4 divisors (see below), whose sum is σ = 26911508200. Its totient is φ = 24220357344.

The previous prime is 25565932753. The next prime is 25565932787. The reversal of 25565932771 is 17723956552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25565932771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25565932751) 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, 672787686 + ... + 672787723.

It is an arithmetic number, because the mean of its divisors is an integer number (6727877050).

Almost surely, 2^25565932771 is an apocalyptic number.

25565932771 is a deficient number, since it is larger than the sum of its proper divisors (1345575429).

25565932771 is a wasteful number, since it uses less digits than its factorization.

25565932771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345575428.

The product of its digits is 3969000, while the sum is 52.

The spelling of 25565932771 in words is "twenty-five billion, five hundred sixty-five million, nine hundred thirty-two thousand, seven hundred seventy-one".