18237013156 has 6 divisors (see below), whose sum is σ = 31914773030. Its totient is φ = 9118506576.

The previous prime is 18237013133. The next prime is 18237013189. The reversal of 18237013156 is 65131073281.

It can be written as a sum of positive squares in only one way, i.e., 18225000000 + 12013156 = 135000^2 + 3466^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2279626641 + ... + 2279626648.

Almost surely, 2^18237013156 is an apocalyptic number.

It is an amenable number.

18237013156 is a deficient number, since it is larger than the sum of its proper divisors (13677759874).

18237013156 is a wasteful number, since it uses less digits than its factorization.

18237013156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559253293 (or 4559253291 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 18237013156 in words is "eighteen billion, two hundred thirty-seven million, thirteen thousand, one hundred fifty-six".