18164981690 has 16 divisors (see below), whose sum is σ = 32705461800. Its totient is φ = 7264104960.

The previous prime is 18164981689. The next prime is 18164981693. The reversal of 18164981690 is 9618946181.

It can be written as a sum of positive squares in 4 ways, for example, as 12083945329 + 6081036361 = 109927^2 + 77981^2 .

It is a super-2 number, since 2×18164981690² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18164981693) 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, 195215 + ... + 272834.

Almost surely, 2^18164981690 is an apocalyptic number.

18164981690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18164981690 is a deficient number, since it is larger than the sum of its proper divisors (14540480110).

18164981690 is a wasteful number, since it uses less digits than its factorization.

18164981690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471937.

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 18164981690 in words is "eighteen billion, one hundred sixty-four million, nine hundred eighty-one thousand, six hundred ninety".