18994425264 has 40 divisors (see below), whose sum is σ = 54521036720. Its totient is φ = 6331474944.

The previous prime is 18994425259. The next prime is 18994425283. The reversal of 18994425264 is 46252449981.

18994425264 is a `hidden beast` number, since 1 + 8 + 99 + 442 + 52 + 64 = 666.

It is a super-2 number, since 2×18994425264² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 18994425264.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21983857 + ... + 21984720.

It is an arithmetic number, because the mean of its divisors is an integer number (1363025918).

Almost surely, 2^18994425264 is an apocalyptic number.

It is an amenable number.

18994425264 is an abundant number, since it is smaller than the sum of its proper divisors (35526611456).

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

18994425264 is a wasteful number, since it uses less digits than its factorization.

18994425264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43968594 (or 43968582 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 18994425264 in words is "eighteen billion, nine hundred ninety-four million, four hundred twenty-five thousand, two hundred sixty-four".