18974208619 has 2 divisors, whose sum is σ = 18974208620. Its totient is φ = 18974208618.

The previous prime is 18974208611. The next prime is 18974208667. The reversal of 18974208619 is 91680247981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18974208619 - 2³ = 18974208611 is a prime.

It is a super-2 number, since 2×18974208619² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18974208619.

It is not a weakly prime, because it can be changed into another prime (18974208611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487104309 + 9487104310.

It is an arithmetic number, because the mean of its divisors is an integer number (9487104310).

Almost surely, 2^18974208619 is an apocalyptic number.

18974208619 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974208619 is an equidigital number, since it uses as much as digits as its factorization.

18974208619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 18974208619 in words is "eighteen billion, nine hundred seventy-four million, two hundred eight thousand, six hundred nineteen".