2168638678488 has 32 divisors (see below), whose sum is σ = 5421635271360. Its totient is φ = 722874416160.

The previous prime is 2168638678433. The next prime is 2168638678517. The reversal of 2168638678488 is 8848768368612.

It is a super-2 number, since 2×2168638678488² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4763443 + ... + 5198813.

It is an arithmetic number, because the mean of its divisors is an integer number (169426102230).

Almost surely, 2^{2168638678488} is an apocalyptic number.

It is an amenable number.

2168638678488 is an abundant number, since it is smaller than the sum of its proper divisors (3252996592872).

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

2168638678488 is a wasteful number, since it uses less digits than its factorization.

2168638678488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642927 (or 642923 counting only the distinct ones).

The product of its digits is 1189085184, while the sum is 75.

The spelling of 2168638678488 in words is "two trillion, one hundred sixty-eight billion, six hundred thirty-eight million, six hundred seventy-eight thousand, four hundred eighty-eight".