664497477 has 18 divisors (see below), whose sum is σ = 1116537318. Its totient is φ = 379712592.

The previous prime is 664497397. The next prime is 664497487. The reversal of 664497477 is 774794466.

664497477 is a `hidden beast` number, since 66 + 449 + 74 + 77 = 666.

It can be written as a sum of positive squares in only one way, i.e., 662856516 + 1640961 = 25746^2 + 1281^2 .

It is not a de Polignac number, because 664497477 - 2¹⁰ = 664496453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664497487) 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 17 ways as a sum of consecutive naturals, for example, 752958 + ... + 753839.

It is an arithmetic number, because the mean of its divisors is an integer number (62029851).

Almost surely, 2^664497477 is an apocalyptic number.

It is an amenable number.

664497477 is a deficient number, since it is larger than the sum of its proper divisors (452039841).

664497477 is a wasteful number, since it uses less digits than its factorization.

664497477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506817 (or 1506807 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The square root of 664497477 is about 25777.8485719813. The cubic root of 664497477 is about 872.6319543833.

The spelling of 664497477 in words is "six hundred sixty-four million, four hundred ninety-seven thousand, four hundred seventy-seven".