25311321378 has 48 divisors (see below), whose sum is σ = 64697458176. Its totient is φ = 6998520960.

The previous prime is 25311321377. The next prime is 25311321389. The reversal of 25311321378 is 87312311352.

It is a happy number.

25311321378 is a `hidden beast` number, since 253 + 1 + 1 + 32 + 1 + 378 = 666.

It is not an unprimeable number, because it can be changed into a prime (25311321377) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3236151 + ... + 3243962.

It is an arithmetic number, because the mean of its divisors is an integer number (1347863712).

Almost surely, 2^25311321378 is an apocalyptic number.

25311321378 is an abundant number, since it is smaller than the sum of its proper divisors (39386136798).

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

25311321378 is a wasteful number, since it uses less digits than its factorization.

25311321378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480159 (or 6480156 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 25311321378 in words is "twenty-five billion, three hundred eleven million, three hundred twenty-one thousand, three hundred seventy-eight".