16689716840 has 16 divisors (see below), whose sum is σ = 37551862980. Its totient is φ = 6675886720.

The previous prime is 16689716839. The next prime is 16689716861. The reversal of 16689716840 is 4861798661.

It can be written as a sum of positive squares in 2 ways, for example, as 14428333924 + 2261382916 = 120118^2 + 47554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208621421 + ... + 208621500.

Almost surely, 2^16689716840 is an apocalyptic number.

16689716840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16689716840 is an abundant number, since it is smaller than the sum of its proper divisors (20862146140).

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

16689716840 is a wasteful number, since it uses less digits than its factorization.

16689716840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417242932 (or 417242928 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 16689716840 in words is "sixteen billion, six hundred eighty-nine million, seven hundred sixteen thousand, eight hundred forty".