16688370816 has 128 divisors (see below), whose sum is σ = 53042774400. Its totient is φ = 5134869504.

The previous prime is 16688370799. The next prime is 16688370817. The reversal of 16688370816 is 61807388661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (16688370817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140796 + ... + 230651.

It is an arithmetic number, because the mean of its divisors is an integer number (414396675).

Almost surely, 2^16688370816 is an apocalyptic number.

16688370816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16688370816 is an abundant number, since it is smaller than the sum of its proper divisors (36354403584).

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

16688370816 is a wasteful number, since it uses less digits than its factorization.

16688370816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371483 (or 371465 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 16688370816 in words is "sixteen billion, six hundred eighty-eight million, three hundred seventy thousand, eight hundred sixteen".