16172658623 has 4 divisors (see below), whose sum is σ = 17642900328. Its totient is φ = 14702416920.

The previous prime is 16172658613. The next prime is 16172658643. The reversal of 16172658623 is 32685627161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16172658623 is a prime.

It is a super-2 number, since 2×16172658623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16172658613) 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, 735120836 + ... + 735120857.

It is an arithmetic number, because the mean of its divisors is an integer number (4410725082).

Almost surely, 2^16172658623 is an apocalyptic number.

16172658623 is a deficient number, since it is larger than the sum of its proper divisors (1470241705).

16172658623 is a wasteful number, since it uses less digits than its factorization.

16172658623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470241704.

The product of its digits is 725760, while the sum is 47.

The spelling of 16172658623 in words is "sixteen billion, one hundred seventy-two million, six hundred fifty-eight thousand, six hundred twenty-three".