18067811817 has 32 divisors (see below), whose sum is σ = 26990054784. Its totient is φ = 10655884800.

The previous prime is 18067811791. The next prime is 18067811819. The reversal of 18067811817 is 71811876081.

It is not a de Polignac number, because 18067811817 - 2⁶ = 18067811753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18067811819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 520323 + ... + 553959.

It is an arithmetic number, because the mean of its divisors is an integer number (843439212).

Almost surely, 2^18067811817 is an apocalyptic number.

It is an amenable number.

18067811817 is a deficient number, since it is larger than the sum of its proper divisors (8922242967).

18067811817 is a wasteful number, since it uses less digits than its factorization.

18067811817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34089.

The product of its (nonzero) digits is 150528, while the sum is 48.

The spelling of 18067811817 in words is "eighteen billion, sixty-seven million, eight hundred eleven thousand, eight hundred seventeen".