25520011771 has 12 divisors (see below), whose sum is σ = 27154341568. Its totient is φ = 23979100032.

The previous prime is 25520011763. The next prime is 25520011799. The reversal of 25520011771 is 17711002552.

It is not a de Polignac number, because 25520011771 - 2³ = 25520011763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520011171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102685 + ... + 248161.

Almost surely, 2^25520011771 is an apocalyptic number.

25520011771 is a deficient number, since it is larger than the sum of its proper divisors (1634329797).

25520011771 is a wasteful number, since it uses less digits than its factorization.

25520011771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146118 (or 146101 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 31.

The spelling of 25520011771 in words is "twenty-five billion, five hundred twenty million, eleven thousand, seven hundred seventy-one".