666984477 has 8 divisors (see below), whose sum is σ = 941625216. Its totient is φ = 418500032.

The previous prime is 666984469. The next prime is 666984491. The reversal of 666984477 is 774489666.

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 666984477 - 2³ = 666984469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666984467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6539013 + ... + 6539114.

It is an arithmetic number, because the mean of its divisors is an integer number (117703152).

Almost surely, 2^666984477 is an apocalyptic number.

It is an amenable number.

666984477 is a deficient number, since it is larger than the sum of its proper divisors (274640739).

666984477 is a wasteful number, since it uses less digits than its factorization.

666984477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13078147.

The product of its digits is 12192768, while the sum is 57.

The square root of 666984477 is about 25826.0426120612. The cubic root of 666984477 is about 873.7192591328.

The spelling of 666984477 in words is "six hundred sixty-six million, nine hundred eighty-four thousand, four hundred seventy-seven".