16638883904 has 14 divisors (see below), whose sum is σ = 33017785374. Its totient is φ = 8319441920.

The previous prime is 16638883897. The next prime is 16638884029. The reversal of 16638883904 is 40938883661.

It can be written as a sum of positive squares in only one way, i.e., 14315643904 + 2323240000 = 119648^2 + 48200^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16638883904.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129991217 + ... + 129991344.

It is an arithmetic number, because the mean of its divisors is an integer number (2358413241).

Almost surely, 2^16638883904 is an apocalyptic number.

It is an amenable number.

16638883904 is a deficient number, since it is larger than the sum of its proper divisors (16378901470).

16638883904 is an equidigital number, since it uses as much as digits as its factorization.

16638883904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259982573 (or 259982563 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 16638883904 in words is "sixteen billion, six hundred thirty-eight million, eight hundred eighty-three thousand, nine hundred four".