18604855864 has 48 divisors (see below), whose sum is σ = 40600748880. Its totient is φ = 7969328640.

The previous prime is 18604855861. The next prime is 18604855883. The reversal of 18604855864 is 46855840681.

It is a super-2 number, since 2×18604855864² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18604855861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 804349 + ... + 827155.

It is an arithmetic number, because the mean of its divisors is an integer number (845848935).

Almost surely, 2^18604855864 is an apocalyptic number.

18604855864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18604855864 is an abundant number, since it is smaller than the sum of its proper divisors (21995893016).

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

18604855864 is a wasteful number, since it uses less digits than its factorization.

18604855864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24908 (or 24897 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 55.

The spelling of 18604855864 in words is "eighteen billion, six hundred four million, eight hundred fifty-five thousand, eight hundred sixty-four".