667297399 has 8 divisors (see below), whose sum is σ = 681873408. Its totient is φ = 652737240.

The previous prime is 667297369. The next prime is 667297403. The reversal of 667297399 is 993792766.

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 667297399 - 2¹⁷ = 667166327 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 (667297339) 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 7 ways as a sum of consecutive naturals, for example, 128634 + ... + 133720.

It is an arithmetic number, because the mean of its divisors is an integer number (85234176).

Almost surely, 2^667297399 is an apocalyptic number.

667297399 is a deficient number, since it is larger than the sum of its proper divisors (14576009).

667297399 is a wasteful number, since it uses less digits than its factorization.

667297399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7925.

The product of its digits is 7715736, while the sum is 58.

The square root of 667297399 is about 25832.1001662660. The cubic root of 667297399 is about 873.8558756217.

The spelling of 667297399 in words is "six hundred sixty-seven million, two hundred ninety-seven thousand, three hundred ninety-nine".