18131699716 has 27 divisors (see below), whose sum is σ = 34365670101. Its totient is φ = 8366860944.

The previous prime is 18131699713. The next prime is 18131699717. The reversal of 18131699716 is 61799613181.

The square root of 18131699716 is 134654.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2682204100 + 15449495616 = 51790^2 + 124296^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18131699713) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3498415 + ... + 3503593.

Almost surely, 2^18131699716 is an apocalyptic number.

18131699716 is the 134654-th square number.

It is an amenable number.

18131699716 is a deficient number, since it is larger than the sum of its proper divisors (16233970385).

18131699716 is an frugal number, since it uses more digits than its factorization.

18131699716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10388 (or 5194 counting only the distinct ones).

The product of its digits is 489888, while the sum is 52.

The spelling of 18131699716 in words is "eighteen billion, one hundred thirty-one million, six hundred ninety-nine thousand, seven hundred sixteen".