18509429972 has 48 divisors (see below), whose sum is σ = 35525153664. Its totient is φ = 8368512000.

The previous prime is 18509429971. The next prime is 18509430001. The reversal of 18509429972 is 27992490581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18509429971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8113472 + ... + 8115752.

It is an arithmetic number, because the mean of its divisors is an integer number (740107368).

Almost surely, 2^18509429972 is an apocalyptic number.

It is an amenable number.

18509429972 is a deficient number, since it is larger than the sum of its proper divisors (17015723692).

18509429972 is a wasteful number, since it uses less digits than its factorization.

18509429972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200 (or 3198 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 18509429972 in words is "eighteen billion, five hundred nine million, four hundred twenty-nine thousand, nine hundred seventy-two".