18797731645 has 64 divisors (see below), whose sum is σ = 28617670656. Its totient is φ = 11513940480.

The previous prime is 18797731627. The next prime is 18797731661. The reversal of 18797731645 is 54613779781.

It is not a de Polignac number, because 18797731645 - 2⁷ = 18797731517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18797731645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5229969 + ... + 5233561.

It is an arithmetic number, because the mean of its divisors is an integer number (447151104).

Almost surely, 2^18797731645 is an apocalyptic number.

It is an amenable number.

18797731645 is a deficient number, since it is larger than the sum of its proper divisors (9819939011).

18797731645 is a wasteful number, since it uses less digits than its factorization.

18797731645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850.

The product of its digits is 8890560, while the sum is 58.

The spelling of 18797731645 in words is "eighteen billion, seven hundred ninety-seven million, seven hundred thirty-one thousand, six hundred forty-five".