166994164777 has 4 divisors (see below), whose sum is σ = 182175452496. Its totient is φ = 151812877060.

The previous prime is 166994164759. The next prime is 166994164781. The reversal of 166994164777 is 777461499661.

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 not a de Polignac number, because 166994164777 - 2¹¹ = 166994162729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166994164177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7590643843 + ... + 7590643864.

It is an arithmetic number, because the mean of its divisors is an integer number (45543863124).

Almost surely, 2^166994164777 is an apocalyptic number.

It is an amenable number.

166994164777 is a deficient number, since it is larger than the sum of its proper divisors (15181287719).

166994164777 is a wasteful number, since it uses less digits than its factorization.

166994164777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15181287718.

The product of its digits is 96018048, while the sum is 67.

The spelling of 166994164777 in words is "one hundred sixty-six billion, nine hundred ninety-four million, one hundred sixty-four thousand, seven hundred seventy-seven".