18316771525 has 24 divisors (see below), whose sum is σ = 25056536904. Its totient is φ = 13196313600.

The previous prime is 18316771513. The next prime is 18316771541. The reversal of 18316771525 is 52517761381.

It can be written as a sum of positive squares in 12 ways, for example, as 14952887524 + 3363884001 = 122282^2 + 57999^2 .

It is not a de Polignac number, because 18316771525 - 2⁹ = 18316771013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673984 + ... + 700633.

It is an arithmetic number, because the mean of its divisors is an integer number (1044022371).

Almost surely, 2^18316771525 is an apocalyptic number.

It is an amenable number.

18316771525 is a deficient number, since it is larger than the sum of its proper divisors (6739765379).

18316771525 is a wasteful number, since it uses less digits than its factorization.

18316771525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374681 (or 1374676 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The spelling of 18316771525 in words is "eighteen billion, three hundred sixteen million, seven hundred seventy-one thousand, five hundred twenty-five".