18919862997 has 48 divisors (see below), whose sum is σ = 32232706560. Its totient is φ = 9796979808.

The previous prime is 18919862963. The next prime is 18919862999. The reversal of 18919862997 is 79926891981.

It is not a de Polignac number, because 18919862997 - 2¹⁰ = 18919861973 is a prime.

It is a super-2 number, since 2×18919862997² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919862999) 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 47 ways as a sum of consecutive naturals, for example, 83023 + ... + 211500.

It is an arithmetic number, because the mean of its divisors is an integer number (671514720).

Almost surely, 2^18919862997 is an apocalyptic number.

It is an amenable number.

18919862997 is a deficient number, since it is larger than the sum of its proper divisors (13312843563).

18919862997 is a wasteful number, since it uses less digits than its factorization.

18919862997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294582 (or 294575 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 69.

The spelling of 18919862997 in words is "eighteen billion, nine hundred nineteen million, eight hundred sixty-two thousand, nine hundred ninety-seven".