25426402391 has 4 divisors (see below), whose sum is σ = 27382279512. Its totient is φ = 23470525272.

The previous prime is 25426402367. The next prime is 25426402429. The reversal of 25426402391 is 19320462452.

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 25426402391 - 2⁶ = 25426402327 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 (25426402361) 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, 977938541 + ... + 977938566.

It is an arithmetic number, because the mean of its divisors is an integer number (6845569878).

Almost surely, 2^25426402391 is an apocalyptic number.

25426402391 is a deficient number, since it is larger than the sum of its proper divisors (1955877121).

25426402391 is a wasteful number, since it uses less digits than its factorization.

25426402391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955877120.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 25426402391 in words is "twenty-five billion, four hundred twenty-six million, four hundred two thousand, three hundred ninety-one".