18400864325 has 12 divisors (see below), whose sum is σ = 22821428100. Its totient is φ = 14717880960.

The previous prime is 18400864253. The next prime is 18400864333. The reversal of 18400864325 is 52346800481.

It can be written as a sum of positive squares in 6 ways, for example, as 4619513089 + 13781351236 = 67967^2 + 117394^2 .

It is not a de Polignac number, because 18400864325 - 2¹⁶ = 18400798789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68687 + ... + 203763.

It is an arithmetic number, because the mean of its divisors is an integer number (1901785675).

Almost surely, 2^18400864325 is an apocalyptic number.

It is an amenable number.

18400864325 is a deficient number, since it is larger than the sum of its proper divisors (4420563775).

18400864325 is a wasteful number, since it uses less digits than its factorization.

18400864325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140536 (or 140531 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 18400864325 in words is "eighteen billion, four hundred million, eight hundred sixty-four thousand, three hundred twenty-five".