18638722067 has 12 divisors (see below), whose sum is σ = 21684475800. Its totient is φ = 15974060256.

The previous prime is 18638722061. The next prime is 18638722099. The reversal of 18638722067 is 76022783681.

It is not a de Polignac number, because 18638722067 - 2¹⁰ = 18638721043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18638722061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 484559 + ... + 521607.

It is an arithmetic number, because the mean of its divisors is an integer number (1807039650).

Almost surely, 2^18638722067 is an apocalyptic number.

18638722067 is a deficient number, since it is larger than the sum of its proper divisors (3045753733).

18638722067 is a wasteful number, since it uses less digits than its factorization.

18638722067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47330 (or 47323 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 18638722067 in words is "eighteen billion, six hundred thirty-eight million, seven hundred twenty-two thousand, sixty-seven".