18497644972 has 6 divisors (see below), whose sum is σ = 32370878708. Its totient is φ = 9248822484.

The previous prime is 18497644969. The next prime is 18497644973. The reversal of 18497644972 is 27944679481.

It is a self number, because there is not a number n which added to its sum of digits gives 18497644972.

It is not an unprimeable number, because it can be changed into a prime (18497644973) 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 as a sum of consecutive naturals, namely, 2312205618 + ... + 2312205625.

Almost surely, 2^18497644972 is an apocalyptic number.

It is an amenable number.

18497644972 is a deficient number, since it is larger than the sum of its proper divisors (13873233736).

18497644972 is a wasteful number, since it uses less digits than its factorization.

18497644972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624411247 (or 4624411245 counting only the distinct ones).

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

The spelling of 18497644972 in words is "eighteen billion, four hundred ninety-seven million, six hundred forty-four thousand, nine hundred seventy-two".