667666077 has 16 divisors (see below), whose sum is σ = 959289408. Its totient is φ = 410618880.

The previous prime is 667666063. The next prime is 667666079. The reversal of 667666077 is 770666766.

It is not a de Polignac number, because 667666077 - 2⁷ = 667665949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667666079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74173 + ... + 82685.

It is an arithmetic number, because the mean of its divisors is an integer number (59955588).

Almost surely, 2^667666077 is an apocalyptic number.

It is an amenable number.

667666077 is a deficient number, since it is larger than the sum of its proper divisors (291623331).

667666077 is a wasteful number, since it uses less digits than its factorization.

667666077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540.

The product of its (nonzero) digits is 2667168, while the sum is 51.

The square root of 667666077 is about 25839.2352247508. The cubic root of 667666077 is about 874.0167794519.

The spelling of 667666077 in words is "six hundred sixty-seven million, six hundred sixty-six thousand, seventy-seven".