166722165611 has 16 divisors (see below), whose sum is σ = 168823666368. Its totient is φ = 164630256000.

The previous prime is 166722165601. The next prime is 166722165629. The reversal of 166722165611 is 116561227661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166722165611 - 2¹⁴ = 166722149227 is a prime.

It is a super-2 number, since 2×166722165611² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166722165601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88822805 + ... + 88824681.

It is an arithmetic number, because the mean of its divisors is an integer number (10551479148).

Almost surely, 2^166722165611 is an apocalyptic number.

166722165611 is a deficient number, since it is larger than the sum of its proper divisors (2101500757).

166722165611 is a wasteful number, since it uses less digits than its factorization.

166722165611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862.

The product of its digits is 181440, while the sum is 44.

The spelling of 166722165611 in words is "one hundred sixty-six billion, seven hundred twenty-two million, one hundred sixty-five thousand, six hundred eleven".