16686679140 has 72 divisors (see below), whose sum is σ = 51138130680. Its totient is φ = 4403902464.

The previous prime is 16686679133. The next prime is 16686679157. The reversal of 16686679140 is 4197668661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1962312804 + 14724366336 = 44298^2 + 121344^2 .

It is a super-2 number, since 2×16686679140² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 460395 + ... + 495314.

It is an arithmetic number, because the mean of its divisors is an integer number (710251815).

Almost surely, 2^16686679140 is an apocalyptic number.

16686679140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16686679140 is an abundant number, since it is smaller than the sum of its proper divisors (34451451540).

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

16686679140 is a wasteful number, since it uses less digits than its factorization.

16686679140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955821 (or 955816 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 16686679140 in words is "sixteen billion, six hundred eighty-six million, six hundred seventy-nine thousand, one hundred forty".