16872657621 has 4 divisors (see below), whose sum is σ = 22496876832. Its totient is φ = 11248438412.

The previous prime is 16872657619. The next prime is 16872657629. The reversal of 16872657621 is 12675627861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16872657621 - 2¹ = 16872657619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16872657629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2812109601 + ... + 2812109606.

It is an arithmetic number, because the mean of its divisors is an integer number (5624219208).

Almost surely, 2^16872657621 is an apocalyptic number.

It is an amenable number.

16872657621 is a deficient number, since it is larger than the sum of its proper divisors (5624219211).

16872657621 is an equidigital number, since it uses as much as digits as its factorization.

16872657621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624219210.

The product of its digits is 1693440, while the sum is 51.

The spelling of 16872657621 in words is "sixteen billion, eight hundred seventy-two million, six hundred fifty-seven thousand, six hundred twenty-one".