664397351 has 4 divisors (see below), whose sum is σ = 666248400. Its totient is φ = 662546304.

The previous prime is 664397341. The next prime is 664397369. The reversal of 664397351 is 153793466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664397351 is a prime.

It is a super-3 number, since 3×664397351³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664397341) 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 3 ways as a sum of consecutive naturals, for example, 924986 + ... + 925703.

It is an arithmetic number, because the mean of its divisors is an integer number (166562100).

Almost surely, 2^664397351 is an apocalyptic number.

664397351 is a deficient number, since it is larger than the sum of its proper divisors (1851049).

664397351 is a wasteful number, since it uses less digits than its factorization.

664397351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851048.

The product of its digits is 408240, while the sum is 44.

The square root of 664397351 is about 25775.9064050132. The cubic root of 664397351 is about 872.5881229974.

The spelling of 664397351 in words is "six hundred sixty-four million, three hundred ninety-seven thousand, three hundred fifty-one".