18691634724712 has 8 divisors (see below), whose sum is σ = 35046815108850. Its totient is φ = 9345817362352.

The previous prime is 18691634724703. The next prime is 18691634724739. The reversal of 18691634724712 is 21742743619681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15248509544356 + 3443125180356 = 3904934^2 + 1855566^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1168227170287 + ... + 1168227170302.

Almost surely, 2^{18691634724712} is an apocalyptic number.

It is an amenable number.

18691634724712 is a deficient number, since it is larger than the sum of its proper divisors (16355180384138).

18691634724712 is a wasteful number, since it uses less digits than its factorization.

18691634724712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336454340595 (or 2336454340591 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 18691634724712 in words is "eighteen trillion, six hundred ninety-one billion, six hundred thirty-four million, seven hundred twenty-four thousand, seven hundred twelve".