18844987464 has 24 divisors (see below), whose sum is σ = 51038507910. Its totient is φ = 6281662464.

The previous prime is 18844987409. The next prime is 18844987477. The reversal of 18844987464 is 46478944881.

18844987464 is a `hidden beast` number, since 1 + 8 + 84 + 4 + 98 + 7 + 464 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10212719364 + 8632268100 = 101058^2 + 92910^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-4 number, since 4×18844987464⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130867897 + ... + 130868040.

Almost surely, 2^18844987464 is an apocalyptic number.

It is an amenable number.

18844987464 is an abundant number, since it is smaller than the sum of its proper divisors (32193520446).

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

18844987464 is a wasteful number, since it uses less digits than its factorization.

18844987464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261735949 (or 261735942 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 63.

The spelling of 18844987464 in words is "eighteen billion, eight hundred forty-four million, nine hundred eighty-seven thousand, four hundred sixty-four".