664535684 has 6 divisors (see below), whose sum is σ = 1162937454. Its totient is φ = 332267840.

The previous prime is 664535633. The next prime is 664535687. The reversal of 664535684 is 486535466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 396886084 + 267649600 = 19922^2 + 16360^2 .

It is not an unprimeable number, because it can be changed into a prime (664535687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83066957 + ... + 83066964.

It is an arithmetic number, because the mean of its divisors is an integer number (193822909).

Almost surely, 2^664535684 is an apocalyptic number.

It is an amenable number.

664535684 is a deficient number, since it is larger than the sum of its proper divisors (498401770).

664535684 is a wasteful number, since it uses less digits than its factorization.

664535684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166133925 (or 166133923 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The square root of 664535684 is about 25778.5896433455. The cubic root of 664535684 is about 872.6486788060.

The spelling of 664535684 in words is "six hundred sixty-four million, five hundred thirty-five thousand, six hundred eighty-four".