166680077 has 4 divisors (see below), whose sum is σ = 167952576. Its totient is φ = 165407580.

The previous prime is 166680067. The next prime is 166680089. The reversal of 166680077 is 770086661.

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-166680077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166680037) 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, 636053 + ... + 636314.

It is an arithmetic number, because the mean of its divisors is an integer number (41988144).

Almost surely, 2^166680077 is an apocalyptic number.

It is an amenable number.

166680077 is a deficient number, since it is larger than the sum of its proper divisors (1272499).

166680077 is a wasteful number, since it uses less digits than its factorization.

166680077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272498.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 166680077 is about 12910.4638568876. The cubic root of 166680077 is about 550.3359677349.

The spelling of 166680077 in words is "one hundred sixty-six million, six hundred eighty thousand, seventy-seven".