25440111477 has 16 divisors (see below), whose sum is σ = 41115332160. Its totient is φ = 15418249200.

The previous prime is 25440111451. The next prime is 25440111493. The reversal of 25440111477 is 77411104452.

It is not a de Polignac number, because 25440111477 - 2⁶ = 25440111413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440111407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42828174 + ... + 42828767.

It is an arithmetic number, because the mean of its divisors is an integer number (2569708260).

Almost surely, 2^25440111477 is an apocalyptic number.

25440111477 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25440111477 is a deficient number, since it is larger than the sum of its proper divisors (15675220683).

25440111477 is a wasteful number, since it uses less digits than its factorization.

25440111477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85656961 (or 85656955 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 25440111477 in words is "twenty-five billion, four hundred forty million, one hundred eleven thousand, four hundred seventy-seven".