667678313 has 4 divisors (see below), whose sum is σ = 668405760. Its totient is φ = 666950868.

The previous prime is 667678309. The next prime is 667678331. The reversal of 667678313 is 313876766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667678313 - 2² = 667678309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667678303) 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 3 ways as a sum of consecutive naturals, for example, 362345 + ... + 364182.

It is an arithmetic number, because the mean of its divisors is an integer number (167101440).

Almost surely, 2^667678313 is an apocalyptic number.

It is an amenable number.

667678313 is a deficient number, since it is larger than the sum of its proper divisors (727447).

667678313 is an equidigital number, since it uses as much as digits as its factorization.

667678313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727446.

The product of its digits is 762048, while the sum is 47.

The square root of 667678313 is about 25839.4719953795. The cubic root of 667678313 is about 874.0221186498.

The spelling of 667678313 in words is "six hundred sixty-seven million, six hundred seventy-eight thousand, three hundred thirteen".