18736734042 has 96 divisors (see below), whose sum is σ = 46368071568. Its totient is φ = 5416962048.

The previous prime is 18736733993. The next prime is 18736734061. The reversal of 18736734042 is 24043763781.

18736734042 is a `hidden beast` number, since 187 + 3 + 67 + 3 + 404 + 2 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 9191248641 + 9545485401 = 95871^2 + 97701^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2594028 + ... + 2601240.

Almost surely, 2^18736734042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18736734042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23184035784).

18736734042 is an abundant number, since it is smaller than the sum of its proper divisors (27631337526).

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

18736734042 is a wasteful number, since it uses less digits than its factorization.

18736734042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904 (or 7901 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 18736734042 in words is "eighteen billion, seven hundred thirty-six million, seven hundred thirty-four thousand, forty-two".