18690081512 has 16 divisors (see below), whose sum is σ = 35390873700. Its totient is φ = 9252515200.

The previous prime is 18690081511. The next prime is 18690081521. The reversal of 18690081512 is 21518009681.

It can be written as a sum of positive squares in 2 ways, for example, as 11980178116 + 6709903396 = 109454^2 + 81914^2 .

It is a super-2 number, since 2×18690081512² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18690081512.

It is not an unprimeable number, because it can be changed into a prime (18690081511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11564837 + ... + 11566452.

Almost surely, 2^18690081512 is an apocalyptic number.

It is an amenable number.

18690081512 is a deficient number, since it is larger than the sum of its proper divisors (16700792188).

18690081512 is a wasteful number, since it uses less digits than its factorization.

18690081512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23131396 (or 23131392 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 18690081512 in words is "eighteen billion, six hundred ninety million, eighty-one thousand, five hundred twelve".