18837198965 has 16 divisors (see below), whose sum is σ = 25182889200. Its totient is φ = 13430871552.

The previous prime is 18837198917. The next prime is 18837198967. The reversal of 18837198965 is 56989173881.

It can be written as a sum of positive squares in 8 ways, for example, as 287031364 + 18550167601 = 16942^2 + 136199^2 .

It is a cyclic number.

It is not a de Polignac number, because 18837198965 - 2¹⁸ = 18836936821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18837198967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4994720 + ... + 4998489.

It is an arithmetic number, because the mean of its divisors is an integer number (1573930575).

Almost surely, 2^18837198965 is an apocalyptic number.

It is an amenable number.

18837198965 is a deficient number, since it is larger than the sum of its proper divisors (6345690235).

18837198965 is a wasteful number, since it uses less digits than its factorization.

18837198965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9993256.

The product of its digits is 26127360, while the sum is 65.

The spelling of 18837198965 in words is "eighteen billion, eight hundred thirty-seven million, one hundred ninety-eight thousand, nine hundred sixty-five".