25366991979 has 16 divisors (see below), whose sum is σ = 40688910080. Its totient is φ = 13732506720.

The previous prime is 25366991977. The next prime is 25366991999. The reversal of 25366991979 is 97919966352.

It is not a de Polignac number, because 25366991979 - 2¹ = 25366991977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25366991971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31787812 + ... + 31788609.

It is an arithmetic number, because the mean of its divisors is an integer number (2543056880).

Almost surely, 2^25366991979 is an apocalyptic number.

25366991979 is a deficient number, since it is larger than the sum of its proper divisors (15321918101).

25366991979 is a wasteful number, since it uses less digits than its factorization.

25366991979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63576450.

The product of its digits is 49601160, while the sum is 66.

The spelling of 25366991979 in words is "twenty-five billion, three hundred sixty-six million, nine hundred ninety-one thousand, nine hundred seventy-nine".