18397667044 has 9 divisors (see below), whose sum is σ = 32196392067. Its totient is φ = 9198697884.

The previous prime is 18397667033. The next prime is 18397667059. The reversal of 18397667044 is 44076679381.

The square root of 18397667044 is 135638.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 237367 + ... + 305185.

Almost surely, 2^18397667044 is an apocalyptic number.

18397667044 is the 135638-th square number.

It is an amenable number.

18397667044 is a deficient number, since it is larger than the sum of its proper divisors (13798725023).

18397667044 is an frugal number, since it uses more digits than its factorization.

18397667044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135642 (or 67821 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 18397667044 in words is "eighteen billion, three hundred ninety-seven million, six hundred sixty-seven thousand, forty-four".