18997965268 has 12 divisors (see below), whose sum is σ = 33249126400. Its totient is φ = 9498214872.

The previous prime is 18997965253. The next prime is 18997965281. The reversal of 18997965268 is 86256979981.

It is a junction number, because it is equal to n+sod(n) for n = 18997965197 and 18997965206.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 134346 + ... + 236737.

Almost surely, 2^18997965268 is an apocalyptic number.

It is an amenable number.

18997965268 is a deficient number, since it is larger than the sum of its proper divisors (14251161132).

18997965268 is a wasteful number, since it uses less digits than its factorization.

18997965268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383886 (or 383884 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 70.

The spelling of 18997965268 in words is "eighteen billion, nine hundred ninety-seven million, nine hundred sixty-five thousand, two hundred sixty-eight".