18615019308 has 12 divisors (see below), whose sum is σ = 43435045080. Its totient is φ = 6205006432.

The previous prime is 18615019307. The next prime is 18615019331. The reversal of 18615019308 is 80391051681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18615019308.

It is not an unprimeable number, because it can be changed into a prime (18615019307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775625793 + ... + 775625816.

It is an arithmetic number, because the mean of its divisors is an integer number (3619587090).

Almost surely, 2^18615019308 is an apocalyptic number.

It is an amenable number.

18615019308 is an abundant number, since it is smaller than the sum of its proper divisors (24820025772).

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

18615019308 is a wasteful number, since it uses less digits than its factorization.

18615019308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551251616 (or 1551251614 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 18615019308 in words is "eighteen billion, six hundred fifteen million, nineteen thousand, three hundred eight".