18879947019 has 16 divisors (see below), whose sum is σ = 28872560640. Its totient is φ = 12180610440.

The previous prime is 18879947011. The next prime is 18879947027. The reversal of 18879947019 is 91074997881.

It is a happy number.

18879947019 is a `hidden beast` number, since 1 + 88 + 79 + 9 + 470 + 19 = 666.

It is an interprime number because it is at equal distance from previous prime (18879947011) and next prime (18879947027).

It is not a de Polignac number, because 18879947019 - 2³ = 18879947011 is a prime.

It is a super-2 number, since 2×18879947019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18879947011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11277507 + ... + 11279180.

It is an arithmetic number, because the mean of its divisors is an integer number (1804535040).

Almost surely, 2^18879947019 is an apocalyptic number.

18879947019 is a deficient number, since it is larger than the sum of its proper divisors (9992613621).

18879947019 is a wasteful number, since it uses less digits than its factorization.

18879947019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22556727 (or 22556721 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 63.

The spelling of 18879947019 in words is "eighteen billion, eight hundred seventy-nine million, nine hundred forty-seven thousand, nineteen".