18748436868 has 72 divisors (see below), whose sum is σ = 55483209600. Its totient is φ = 5226042240.

The previous prime is 18748436857. The next prime is 18748436873. The reversal of 18748436868 is 86863484781.

18748436868 is a `hidden beast` number, since 1 + 87 + 48 + 436 + 86 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 896968 + ... + 917631.

Almost surely, 2^18748436868 is an apocalyptic number.

18748436868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18748436868 is an abundant number, since it is smaller than the sum of its proper divisors (36734772732).

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

18748436868 is a wasteful number, since it uses less digits than its factorization.

18748436868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814657 (or 1814652 counting only the distinct ones).

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

The spelling of 18748436868 in words is "eighteen billion, seven hundred forty-eight million, four hundred thirty-six thousand, eight hundred sixty-eight".