666477767 has 8 divisors (see below), whose sum is σ = 670844160. Its totient is φ = 662126080.

The previous prime is 666477761. The next prime is 666477803. The reversal of 666477767 is 767774666.

It is a happy number.

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 666477767 - 2¹⁰ = 666476743 is a prime.

It is a super-2 number, since 2×666477767² = 888385227810612578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666477761) 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 7 ways as a sum of consecutive naturals, for example, 95834 + ... + 102552.

It is an arithmetic number, because the mean of its divisors is an integer number (83855520).

Almost surely, 2^666477767 is an apocalyptic number.

666477767 is a deficient number, since it is larger than the sum of its proper divisors (4366393).

666477767 is a wasteful number, since it uses less digits than its factorization.

666477767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7353.

The product of its digits is 12446784, while the sum is 56.

The square root of 666477767 is about 25816.2306892389. The cubic root of 666477767 is about 873.4979474128.

The spelling of 666477767 in words is "six hundred sixty-six million, four hundred seventy-seven thousand, seven hundred sixty-seven".