18449621874 has 48 divisors (see below), whose sum is σ = 40417016640. Its totient is φ = 6081959520.

The previous prime is 18449621863. The next prime is 18449621951. The reversal of 18449621874 is 47812694481.

18449621874 is a `hidden beast` number, since 1 + 8 + 4 + 4 + 9 + 621 + 8 + 7 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18449621874.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1064619 + ... + 1081809.

It is an arithmetic number, because the mean of its divisors is an integer number (842021180).

Almost surely, 2^18449621874 is an apocalyptic number.

18449621874 is an abundant number, since it is smaller than the sum of its proper divisors (21967394766).

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

18449621874 is a wasteful number, since it uses less digits than its factorization.

18449621874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17855 (or 17852 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 18449621874 in words is "eighteen billion, four hundred forty-nine million, six hundred twenty-one thousand, eight hundred seventy-four".