16939312505 has 8 divisors (see below), whose sum is σ = 20328528192. Its totient is φ = 13550547888.

The previous prime is 16939312501. The next prime is 16939312541. The reversal of 16939312505 is 50521393961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16939312505 - 2² = 16939312501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16939312501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23759 + ... + 185588.

It is an arithmetic number, because the mean of its divisors is an integer number (2541066024).

Almost surely, 2^16939312505 is an apocalyptic number.

It is an amenable number.

16939312505 is a deficient number, since it is larger than the sum of its proper divisors (3389215687).

16939312505 is a wasteful number, since it uses less digits than its factorization.

16939312505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225535.

The product of its (nonzero) digits is 218700, while the sum is 44.

The spelling of 16939312505 in words is "sixteen billion, nine hundred thirty-nine million, three hundred twelve thousand, five hundred five".