16639336840 has 96 divisors (see below), whose sum is σ = 45452013120. Its totient is φ = 5369306112.

The previous prime is 16639336787. The next prime is 16639336907. The reversal of 16639336840 is 4863393661.

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, 21894 + ... + 183733.

It is an arithmetic number, because the mean of its divisors is an integer number (473458470).

Almost surely, 2^16639336840 is an apocalyptic number.

16639336840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16639336840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22726006560).

16639336840 is an abundant number, since it is smaller than the sum of its proper divisors (28812676280).

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

16639336840 is a wasteful number, since it uses less digits than its factorization.

16639336840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205679 (or 205658 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 16639336840 in words is "sixteen billion, six hundred thirty-nine million, three hundred thirty-six thousand, eight hundred forty".