16931138320 has 40 divisors (see below), whose sum is σ = 40107640536. Its totient is φ = 6644671488.

The previous prime is 16931138309. The next prime is 16931138351. The reversal of 16931138320 is 2383113961.

It can be written as a sum of positive squares in 4 ways, for example, as 8591065344 + 8340072976 = 92688^2 + 91324^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 16931138320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1992357 + ... + 2000836.

Almost surely, 2^16931138320 is an apocalyptic number.

16931138320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16931138320 is an abundant number, since it is smaller than the sum of its proper divisors (23176502216).

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

16931138320 is a wasteful number, since it uses less digits than its factorization.

16931138320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993259 (or 3993253 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 16931138320 in words is "sixteen billion, nine hundred thirty-one million, one hundred thirty-eight thousand, three hundred twenty".