18162937561 has 8 divisors (see below), whose sum is σ = 18228207744. Its totient is φ = 18097718160.

The previous prime is 18162937523. The next prime is 18162937567. The reversal of 18162937561 is 16573926181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18162937561 - 2⁷ = 18162937433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18162937567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794866 + ... + 817396.

It is an arithmetic number, because the mean of its divisors is an integer number (2278525968).

Almost surely, 2^18162937561 is an apocalyptic number.

It is an amenable number.

18162937561 is a deficient number, since it is larger than the sum of its proper divisors (65270183).

18162937561 is a wasteful number, since it uses less digits than its factorization.

18162937561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25391.

The product of its digits is 544320, while the sum is 49.

The spelling of 18162937561 in words is "eighteen billion, one hundred sixty-two million, nine hundred thirty-seven thousand, five hundred sixty-one".