664501357 has 8 divisors (see below), whose sum is σ = 715886360. Its totient is φ = 613154880.

The previous prime is 664501339. The next prime is 664501361. The reversal of 664501357 is 753105466.

It can be written as a sum of positive squares in 4 ways, for example, as 22335076 + 642166281 = 4726^2 + 25341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-664501357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664501657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33319 + ... + 49387.

It is an arithmetic number, because the mean of its divisors is an integer number (89485795).

Almost surely, 2^664501357 is an apocalyptic number.

It is an amenable number.

664501357 is a deficient number, since it is larger than the sum of its proper divisors (51385003).

664501357 is a wasteful number, since it uses less digits than its factorization.

664501357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19263.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 664501357 is about 25777.9238302855. The cubic root of 664501357 is about 872.6336528123.

The spelling of 664501357 in words is "six hundred sixty-four million, five hundred one thousand, three hundred fifty-seven".