161666161101129 has 32 divisors (see below), whose sum is σ = 215918525692800. Its totient is φ = 107595830638080.

The previous prime is 161666161101113. The next prime is 161666161101163. The reversal of 161666161101129 is 921101161666161.

It is not a de Polignac number, because 161666161101129 - 2⁴ = 161666161101113 is a prime.

It is a super-2 number, since 2×161666161101129² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161666161105129) 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, 26550524317 + ... + 26550530405.

It is an arithmetic number, because the mean of its divisors is an integer number (6747453927900).

Almost surely, 2^{161666161101129} is an apocalyptic number.

It is an amenable number.

161666161101129 is a deficient number, since it is larger than the sum of its proper divisors (54252364591671).

161666161101129 is a wasteful number, since it uses less digits than its factorization.

161666161101129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12585.

The product of its (nonzero) digits is 139968, while the sum is 48.

The spelling of 161666161101129 in words is "one hundred sixty-one trillion, six hundred sixty-six billion, one hundred sixty-one million, one hundred one thousand, one hundred twenty-nine".