25193640939 has 16 divisors (see below), whose sum is σ = 35166227712. Its totient is φ = 16013166048.

The previous prime is 25193640907. The next prime is 25193640947. The reversal of 25193640939 is 93904639152.

It is not a de Polignac number, because 25193640939 - 2⁵ = 25193640907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25193640891 and 25193640900.

It is not an unprimeable number, because it can be changed into a prime (25193640949) 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, 573484 + ... + 615849.

It is an arithmetic number, because the mean of its divisors is an integer number (2197889232).

Almost surely, 2^25193640939 is an apocalyptic number.

25193640939 is a deficient number, since it is larger than the sum of its proper divisors (9972586773).

25193640939 is a wasteful number, since it uses less digits than its factorization.

25193640939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189666.

The product of its (nonzero) digits is 1574640, while the sum is 51.

The spelling of 25193640939 in words is "twenty-five billion, one hundred ninety-three million, six hundred forty thousand, nine hundred thirty-nine".