16164444321 has 56 divisors (see below), whose sum is σ = 25668536640. Its totient is φ = 10153208736.

The previous prime is 16164444319. The next prime is 16164444323. The reversal of 16164444321 is 12344446161.

16164444321 is a `hidden beast` number, since 1 + 6 + 1 + 644 + 4 + 4 + 3 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (16164444319) and next prime (16164444323).

It is not a de Polignac number, because 16164444321 - 2¹ = 16164444319 is a prime.

It is a super-2 number, since 2×16164444321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16164444323) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1116195 + ... + 1130583.

Almost surely, 2^16164444321 is an apocalyptic number.

It is an amenable number.

16164444321 is a deficient number, since it is larger than the sum of its proper divisors (9504092319).

16164444321 is an equidigital number, since it uses as much as digits as its factorization.

16164444321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14497 (or 14482 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The spelling of 16164444321 in words is "sixteen billion, one hundred sixty-four million, four hundred forty-four thousand, three hundred twenty-one".