16717990845 has 16 divisors (see below), whose sum is σ = 28156616640. Its totient is φ = 8446984704.

The previous prime is 16717990831. The next prime is 16717990879. The reversal of 16717990845 is 54809971761.

It is not a de Polignac number, because 16717990845 - 2⁶ = 16717990781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29329524 + ... + 29330093.

It is an arithmetic number, because the mean of its divisors is an integer number (1759788540).

Almost surely, 2^16717990845 is an apocalyptic number.

16717990845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16717990845 is a deficient number, since it is larger than the sum of its proper divisors (11438625795).

16717990845 is a wasteful number, since it uses less digits than its factorization.

16717990845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58659644.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 16717990845 in words is "sixteen billion, seven hundred seventeen million, nine hundred ninety thousand, eight hundred forty-five".