16165666555 has 8 divisors (see below), whose sum is σ = 19417089744. Its totient is φ = 12920340000.

The previous prime is 16165666549. The next prime is 16165666579. The reversal of 16165666555 is 55566656161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16165666555 - 2²¹ = 16163569403 is a prime.

It is a super-2 number, since 2×16165666555² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1518321 + ... + 1528930.

It is an arithmetic number, because the mean of its divisors is an integer number (2427136218).

Almost surely, 2^16165666555 is an apocalyptic number.

16165666555 is a deficient number, since it is larger than the sum of its proper divisors (3251423189).

16165666555 is a wasteful number, since it uses less digits than its factorization.

16165666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048317.

The product of its digits is 4860000, while the sum is 52.

The spelling of 16165666555 in words is "sixteen billion, one hundred sixty-five million, six hundred sixty-six thousand, five hundred fifty-five".