18084986731961 has 4 divisors (see below), whose sum is σ = 18102392880000. Its totient is φ = 18067580583924.

The previous prime is 18084986731937. The next prime is 18084986731969. The reversal of 18084986731961 is 16913768948081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18084986731961 - 2⁶ = 18084986731897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18084986731969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8703072461 + ... + 8703074538.

It is an arithmetic number, because the mean of its divisors is an integer number (4525598220000).

Almost surely, 2^{18084986731961} is an apocalyptic number.

It is an amenable number.

18084986731961 is a deficient number, since it is larger than the sum of its proper divisors (17406148039).

18084986731961 is a wasteful number, since it uses less digits than its factorization.

18084986731961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17406148038.

The product of its (nonzero) digits is 125411328, while the sum is 71.

The spelling of 18084986731961 in words is "eighteen trillion, eighty-four billion, nine hundred eighty-six million, seven hundred thirty-one thousand, nine hundred sixty-one".