16166501566 has 8 divisors (see below), whose sum is σ = 24250292640. Its totient is φ = 8083070688.

The previous prime is 16166501563. The next prime is 16166501569. The reversal of 16166501566 is 66510566161.

It is an interprime number because it is at equal distance from previous prime (16166501563) and next prime (16166501569).

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

It is a super-2 number, since 2×16166501566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16166501563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122475 + ... + 217561.

It is an arithmetic number, because the mean of its divisors is an integer number (3031286580).

Almost surely, 2^16166501566 is an apocalyptic number.

16166501566 is a deficient number, since it is larger than the sum of its proper divisors (8083791074).

16166501566 is an equidigital number, since it uses as much as digits as its factorization.

16166501566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180098.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 16166501566 in words is "sixteen billion, one hundred sixty-six million, five hundred one thousand, five hundred sixty-six".