18973161507 has 16 divisors (see below), whose sum is σ = 25432888320. Its totient is φ = 12581228352.

The previous prime is 18973161469. The next prime is 18973161527. The reversal of 18973161507 is 70516137981.

It is not a de Polignac number, because 18973161507 - 2¹¹ = 18973159459 is a prime.

It is a super-2 number, since 2×18973161507² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18973161527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621063 + ... + 650895.

It is an arithmetic number, because the mean of its divisors is an integer number (1589555520).

Almost surely, 2^18973161507 is an apocalyptic number.

18973161507 is a deficient number, since it is larger than the sum of its proper divisors (6459726813).

18973161507 is a wasteful number, since it uses less digits than its factorization.

18973161507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30962.

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 18973161507 in words is "eighteen billion, nine hundred seventy-three million, one hundred sixty-one thousand, five hundred seven".