166415631264161 has 4 divisors (see below), whose sum is σ = 166469891336112. Its totient is φ = 166361371192212.

The previous prime is 166415631264119. The next prime is 166415631264209. The reversal of 166415631264161 is 161462136514661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166415631264161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166415631264101) 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, 27130031375 + ... + 27130037508.

It is an arithmetic number, because the mean of its divisors is an integer number (41617472834028).

Almost surely, 2^{166415631264161} is an apocalyptic number.

It is an amenable number.

166415631264161 is a deficient number, since it is larger than the sum of its proper divisors (54260071951).

166415631264161 is an equidigital number, since it uses as much as digits as its factorization.

166415631264161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54260071950.

The product of its digits is 3732480, while the sum is 53.

The spelling of 166415631264161 in words is "one hundred sixty-six trillion, four hundred fifteen billion, six hundred thirty-one million, two hundred sixty-four thousand, one hundred sixty-one".