16764642173 has 4 divisors (see below), whose sum is σ = 16877156700. Its totient is φ = 16652127648.

The previous prime is 16764642137. The next prime is 16764642197. The reversal of 16764642173 is 37124646761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4082954404 + 12681687769 = 63898^2 + 112613^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764642173 - 2¹⁴ = 16764625789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16764642373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56257040 + ... + 56257337.

It is an arithmetic number, because the mean of its divisors is an integer number (4219289175).

Almost surely, 2^16764642173 is an apocalyptic number.

It is an amenable number.

16764642173 is a deficient number, since it is larger than the sum of its proper divisors (112514527).

16764642173 is a wasteful number, since it uses less digits than its factorization.

16764642173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112514526.

The product of its digits is 1016064, while the sum is 47.

The spelling of 16764642173 in words is "sixteen billion, seven hundred sixty-four million, six hundred forty-two thousand, one hundred seventy-three".