18499397512 has 8 divisors (see below), whose sum is σ = 34686370350. Its totient is φ = 9249698752.

The previous prime is 18499397509. The next prime is 18499397551. The reversal of 18499397512 is 21579399481.

It can be written as a sum of positive squares in only one way, i.e., 18437837796 + 61559716 = 135786^2 + 7846^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156212337 + ... + 1156212352.

Almost surely, 2^18499397512 is an apocalyptic number.

It is an amenable number.

18499397512 is a deficient number, since it is larger than the sum of its proper divisors (16186972838).

18499397512 is a wasteful number, since it uses less digits than its factorization.

18499397512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312424695 (or 2312424691 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 58.

The spelling of 18499397512 in words is "eighteen billion, four hundred ninety-nine million, three hundred ninety-seven thousand, five hundred twelve".