25317989979 has 16 divisors (see below), whose sum is σ = 35229883392. Its totient is φ = 16142580608.

The previous prime is 25317989941. The next prime is 25317989987. The reversal of 25317989979 is 97998971352.

It is a cyclic number.

It is not a de Polignac number, because 25317989979 - 2¹² = 25317985883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is not an unprimeable number, because it can be changed into a prime (25317989989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585139 + ... + 626915.

It is an arithmetic number, because the mean of its divisors is an integer number (2201867712).

Almost surely, 2^25317989979 is an apocalyptic number.

25317989979 is a deficient number, since it is larger than the sum of its proper divisors (9911893413).

25317989979 is a wasteful number, since it uses less digits than its factorization.

25317989979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50586.

The product of its digits is 77157360, while the sum is 69.

The spelling of 25317989979 in words is "twenty-five billion, three hundred seventeen million, nine hundred eighty-nine thousand, nine hundred seventy-nine".