664535249 has 8 divisors (see below), whose sum is σ = 759626880. Its totient is φ = 569483136.

The previous prime is 664535243. The next prime is 664535269. The reversal of 664535249 is 942535466.

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 664535249 - 2⁴ = 664535233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664535243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52097 + ... + 63585.

It is an arithmetic number, because the mean of its divisors is an integer number (94953360).

Almost surely, 2^664535249 is an apocalyptic number.

It is an amenable number.

664535249 is a deficient number, since it is larger than the sum of its proper divisors (95091631).

664535249 is a wasteful number, since it uses less digits than its factorization.

664535249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19759.

The product of its digits is 777600, while the sum is 44.

The square root of 664535249 is about 25778.5812061099. The cubic root of 664535249 is about 872.6484883962.

The spelling of 664535249 in words is "six hundred sixty-four million, five hundred thirty-five thousand, two hundred forty-nine".