25731311394 has 16 divisors (see below), whose sum is σ = 51511600800. Its totient is φ = 8568940800.

The previous prime is 25731311381. The next prime is 25731311399. The reversal of 25731311394 is 49311313752.

It is not an unprimeable number, because it can be changed into a prime (25731311399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2033919 + ... + 2046530.

It is an arithmetic number, because the mean of its divisors is an integer number (3219475050).

Almost surely, 2^25731311394 is an apocalyptic number.

25731311394 is an abundant number, since it is smaller than the sum of its proper divisors (25780289406).

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

25731311394 is a wasteful number, since it uses less digits than its factorization.

25731311394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081505.

The product of its digits is 68040, while the sum is 39.

The spelling of 25731311394 in words is "twenty-five billion, seven hundred thirty-one million, three hundred eleven thousand, three hundred ninety-four".