16725651221 has 8 divisors (see below), whose sum is σ = 17455187904. Its totient is φ = 15996309120.

The previous prime is 16725651181. The next prime is 16725651259. The reversal of 16725651221 is 12215652761.

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 16725651221 - 2²⁶ = 16658542357 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 (16725656221) 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, 143150 + ... + 232256.

It is an arithmetic number, because the mean of its divisors is an integer number (2181898488).

Almost surely, 2^16725651221 is an apocalyptic number.

It is an amenable number.

16725651221 is a deficient number, since it is larger than the sum of its proper divisors (729536683).

16725651221 is an equidigital number, since it uses as much as digits as its factorization.

16725651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97291.

The product of its digits is 50400, while the sum is 38.

The spelling of 16725651221 in words is "sixteen billion, seven hundred twenty-five million, six hundred fifty-one thousand, two hundred twenty-one".