18163878672 has 40 divisors (see below), whose sum is σ = 47265876576. Its totient is φ = 6010429696.

The previous prime is 18163878653. The next prime is 18163878679. The reversal of 18163878672 is 27687836181.

It is a super-2 number, since 2×18163878672² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18163878679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1374498 + ... + 1387649.

Almost surely, 2^18163878672 is an apocalyptic number.

18163878672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18163878672 is an abundant number, since it is smaller than the sum of its proper divisors (29101997904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18163878672 is a wasteful number, since it uses less digits than its factorization.

18163878672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762295 (or 2762289 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 57.

The spelling of 18163878672 in words is "eighteen billion, one hundred sixty-three million, eight hundred seventy-eight thousand, six hundred seventy-two".