166887100361 has 4 divisors (see below), whose sum is σ = 168161047824. Its totient is φ = 165613152900.

The previous prime is 166887100349. The next prime is 166887100379. The reversal of 166887100361 is 163001788661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163001788661 = 47 ⋅3468123163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166887100361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166887105361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636973535 + ... + 636973796.

It is an arithmetic number, because the mean of its divisors is an integer number (42040261956).

Almost surely, 2^166887100361 is an apocalyptic number.

It is an amenable number.

166887100361 is a deficient number, since it is larger than the sum of its proper divisors (1273947463).

166887100361 is a wasteful number, since it uses less digits than its factorization.

166887100361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273947462.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 166887100361 in words is "one hundred sixty-six billion, eight hundred eighty-seven million, one hundred thousand, three hundred sixty-one".