25977595979 has 4 divisors (see below), whose sum is σ = 25978064376. Its totient is φ = 25977127584.

The previous prime is 25977595961. The next prime is 25977595981. The reversal of 25977595979 is 97959577952.

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 25977595979 - 2²⁰ = 25976547403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25977595879) 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, 137774 + ... + 266339.

It is an arithmetic number, because the mean of its divisors is an integer number (6494516094).

Almost surely, 2^25977595979 is an apocalyptic number.

25977595979 is a deficient number, since it is larger than the sum of its proper divisors (468397).

25977595979 is an equidigital number, since it uses as much as digits as its factorization.

25977595979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468396.

The product of its digits is 562605750, while the sum is 74.

The spelling of 25977595979 in words is "twenty-five billion, nine hundred seventy-seven million, five hundred ninety-five thousand, nine hundred seventy-nine".