25312931994 has 32 divisors (see below), whose sum is σ = 57919706496. Its totient is φ = 7224569280.

The previous prime is 25312931977. The next prime is 25312932053. The reversal of 25312931994 is 49913921352.

It is a super-2 number, since 2×25312931994² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280717 + ... + 359760.

It is an arithmetic number, because the mean of its divisors is an integer number (1809990828).

Almost surely, 2^25312931994 is an apocalyptic number.

25312931994 is an abundant number, since it is smaller than the sum of its proper divisors (32606774502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25312931994 is a wasteful number, since it uses less digits than its factorization.

25312931994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641430.

The product of its digits is 524880, while the sum is 48.

The spelling of 25312931994 in words is "twenty-five billion, three hundred twelve million, nine hundred thirty-one thousand, nine hundred ninety-four".