166605161566155 has 32 divisors (see below), whose sum is σ = 287088705388800. Its totient is φ = 82016660837760.

The previous prime is 166605161566153. The next prime is 166605161566157. The reversal of 166605161566155 is 551665161506661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166605161566153) and next prime (166605161566157).

It is not a de Polignac number, because 166605161566155 - 2¹ = 166605161566153 is a prime.

It is a super-2 number, since 2×166605161566155² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166605161566153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18918681 + ... + 26289290.

It is an arithmetic number, because the mean of its divisors is an integer number (8971522043400).

Almost surely, 2^{166605161566155} is an apocalyptic number.

166605161566155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166605161566155 is a deficient number, since it is larger than the sum of its proper divisors (120483543822645).

166605161566155 is a wasteful number, since it uses less digits than its factorization.

166605161566155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45226891.

The product of its (nonzero) digits is 29160000, while the sum is 60.

The spelling of 166605161566155 in words is "one hundred sixty-six trillion, six hundred five billion, one hundred sixty-one million, five hundred sixty-six thousand, one hundred fifty-five".