667297397 has 8 divisors (see below), whose sum is σ = 719147520. Its totient is φ = 615521520.

The previous prime is 667297369. The next prime is 667297403. The reversal of 667297397 is 793792766.

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 667297397 - 2⁶ = 667297333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667297327) 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, 872 + ... + 36542.

It is an arithmetic number, because the mean of its divisors is an integer number (89893440).

Almost surely, 2^667297397 is an apocalyptic number.

It is an amenable number.

667297397 is a deficient number, since it is larger than the sum of its proper divisors (51850123).

667297397 is a wasteful number, since it uses less digits than its factorization.

667297397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37123.

The product of its digits is 6001128, while the sum is 56.

The square root of 667297397 is about 25832.1001275545. The cubic root of 667297397 is about 873.8558747487.

The spelling of 667297397 in words is "six hundred sixty-seven million, two hundred ninety-seven thousand, three hundred ninety-seven".