666644077 has 8 divisors (see below), whose sum is σ = 728481600. Its totient is φ = 605012160.

The previous prime is 666644047. The next prime is 666644101. The reversal of 666644077 is 770446666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666644077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666644047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44577 + ... + 57622.

It is an arithmetic number, because the mean of its divisors is an integer number (91060200).

Almost surely, 2^666644077 is an apocalyptic number.

It is an amenable number.

666644077 is a deficient number, since it is larger than the sum of its proper divisors (61837523).

666644077 is a wasteful number, since it uses less digits than its factorization.

666644077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102803.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The square root of 666644077 is about 25819.4515239964. The cubic root of 666644077 is about 873.5705976791.

The spelling of 666644077 in words is "six hundred sixty-six million, six hundred forty-four thousand, seventy-seven".