25400486879 has 4 divisors (see below), whose sum is σ = 26894633184. Its totient is φ = 23906340576.

The previous prime is 25400486849. The next prime is 25400486887. The reversal of 25400486879 is 97868400452.

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

It is a de Polignac number, because none of the positive numbers 2^k-25400486879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25400486879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400486849) 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, 747073127 + ... + 747073160.

It is an arithmetic number, because the mean of its divisors is an integer number (6723658296).

Almost surely, 2^25400486879 is an apocalyptic number.

25400486879 is a deficient number, since it is larger than the sum of its proper divisors (1494146305).

25400486879 is a wasteful number, since it uses less digits than its factorization.

25400486879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494146304.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 25400486879 in words is "twenty-five billion, four hundred million, four hundred eighty-six thousand, eight hundred seventy-nine".