18972370636 has 24 divisors (see below), whose sum is σ = 34853575680. Its totient is φ = 9024579600.

The previous prime is 18972370631. The next prime is 18972370643. The reversal of 18972370636 is 63607327981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18972370631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289320 + ... + 1303951.

It is an arithmetic number, because the mean of its divisors is an integer number (1452232320).

Almost surely, 2^18972370636 is an apocalyptic number.

It is an amenable number.

18972370636 is a deficient number, since it is larger than the sum of its proper divisors (15881205044).

18972370636 is a wasteful number, since it uses less digits than its factorization.

18972370636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593365 (or 2593363 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 18972370636 in words is "eighteen billion, nine hundred seventy-two million, three hundred seventy thousand, six hundred thirty-six".