25449705979 has 4 divisors (see below), whose sum is σ = 25450025040. Its totient is φ = 25449386920.

The previous prime is 25449705977. The next prime is 25449705989. The reversal of 25449705979 is 97950794452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25449705979 - 2¹ = 25449705977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25449705977) 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, 79257 + ... + 239125.

It is an arithmetic number, because the mean of its divisors is an integer number (6362506260).

Almost surely, 2^25449705979 is an apocalyptic number.

25449705979 is a deficient number, since it is larger than the sum of its proper divisors (319061).

25449705979 is a wasteful number, since it uses less digits than its factorization.

25449705979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319060.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 25449705979 in words is "twenty-five billion, four hundred forty-nine million, seven hundred five thousand, nine hundred seventy-nine".