18997630923 has 16 divisors (see below), whose sum is σ = 25593281280. Its totient is φ = 12534197856.

The previous prime is 18997630913. The next prime is 18997630931. The reversal of 18997630923 is 32903679981.

It is not a de Polignac number, because 18997630923 - 2⁴ = 18997630907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18997630913) 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 15 ways as a sum of consecutive naturals, for example, 31936 + ... + 197522.

It is an arithmetic number, because the mean of its divisors is an integer number (1599580080).

Almost surely, 2^18997630923 is an apocalyptic number.

18997630923 is a deficient number, since it is larger than the sum of its proper divisors (6595650357).

18997630923 is a wasteful number, since it uses less digits than its factorization.

18997630923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165986.

The product of its (nonzero) digits is 4408992, while the sum is 57.

The spelling of 18997630923 in words is "eighteen billion, nine hundred ninety-seven million, six hundred thirty thousand, nine hundred twenty-three".