16626560165 has 4 divisors (see below), whose sum is σ = 19951872204. Its totient is φ = 13301248128.

The previous prime is 16626560143. The next prime is 16626560177. The reversal of 16626560165 is 56106562661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56106562661 = 67 ⋅837411383.

It can be written as a sum of positive squares in 2 ways, for example, as 1944633604 + 14681926561 = 44098^2 + 121169^2 .

It is a cyclic number.

It is not a de Polignac number, because 16626560165 - 2⁶ = 16626560101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662656012 + ... + 1662656021.

It is an arithmetic number, because the mean of its divisors is an integer number (4987968051).

Almost surely, 2^16626560165 is an apocalyptic number.

It is an amenable number.

16626560165 is a deficient number, since it is larger than the sum of its proper divisors (3325312039).

16626560165 is an equidigital number, since it uses as much as digits as its factorization.

16626560165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325312038.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 16626560165 in words is "sixteen billion, six hundred twenty-six million, five hundred sixty thousand, one hundred sixty-five".