166516611005 has 12 divisors (see below), whose sum is σ = 212265467220. Its totient is φ = 125377211904.

The previous prime is 166516610993. The next prime is 166516611047. The reversal of 166516611005 is 500116615661.

It can be written as a sum of positive squares in 6 ways, for example, as 16125444196 + 150391166809 = 126986^2 + 387803^2 .

It is not a de Polignac number, because 166516611005 - 2⁶ = 166516610941 is a prime.

It is a super-2 number, since 2×166516611005² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166516611005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57616760 + ... + 57619649.

It is an arithmetic number, because the mean of its divisors is an integer number (17688788935).

Almost surely, 2^166516611005 is an apocalyptic number.

It is an amenable number.

166516611005 is a deficient number, since it is larger than the sum of its proper divisors (45748856215).

166516611005 is a wasteful number, since it uses less digits than its factorization.

166516611005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115236448 (or 115236431 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 166516611005 in words is "one hundred sixty-six billion, five hundred sixteen million, six hundred eleven thousand, five".