18464642325 has 36 divisors (see below), whose sum is σ = 33146064900. Its totient is φ = 9825822720.

The previous prime is 18464642321. The next prime is 18464642381. The reversal of 18464642325 is 52324646481.

18464642325 is a `hidden beast` number, since 184 + 6 + 46 + 423 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 476199684 + 17988442641 = 21822^2 + 134121^2 .

It is not a de Polignac number, because 18464642325 - 2² = 18464642321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18464642321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9639 + ... + 192411.

It is an arithmetic number, because the mean of its divisors is an integer number (920724025).

Almost surely, 2^18464642325 is an apocalyptic number.

18464642325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18464642325 is a deficient number, since it is larger than the sum of its proper divisors (14681422575).

18464642325 is a wasteful number, since it uses less digits than its factorization.

18464642325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183238 (or 183230 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The spelling of 18464642325 in words is "eighteen billion, four hundred sixty-four million, six hundred forty-two thousand, three hundred twenty-five".