666618077 has 8 divisors (see below), whose sum is σ = 679560192. Its totient is φ = 653774800.

The previous prime is 666618067. The next prime is 666618091. The reversal of 666618077 is 770816666.

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

It is a cyclic number.

It is not a de Polignac number, because 666618077 - 2¹⁸ = 666355933 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 (666618067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11018 + ... + 38139.

It is an arithmetic number, because the mean of its divisors is an integer number (84945024).

Almost surely, 2^666618077 is an apocalyptic number.

It is an amenable number.

666618077 is a deficient number, since it is larger than the sum of its proper divisors (12942115).

666618077 is a wasteful number, since it uses less digits than its factorization.

666618077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49419.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 666618077 is about 25818.9480227216. The cubic root of 666618077 is about 873.5592407289.

The spelling of 666618077 in words is "six hundred sixty-six million, six hundred eighteen thousand, seventy-seven".