667405373 has 2 divisors, whose sum is σ = 667405374. Its totient is φ = 667405372.

The previous prime is 667405367. The next prime is 667405399. The reversal of 667405373 is 373504766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533702404 + 133702969 = 23102^2 + 11563^2 .

It is a cyclic number.

It is not a de Polignac number, because 667405373 - 2¹⁰ = 667404349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667405373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667404373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333702686 + 333702687.

It is an arithmetic number, because the mean of its divisors is an integer number (333702687).

Almost surely, 2^667405373 is an apocalyptic number.

It is an amenable number.

667405373 is a deficient number, since it is larger than the sum of its proper divisors (1).

667405373 is an equidigital number, since it uses as much as digits as its factorization.

667405373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 41.

The square root of 667405373 is about 25834.1900008496. The cubic root of 667405373 is about 873.9030053452.

The spelling of 667405373 in words is "six hundred sixty-seven million, four hundred five thousand, three hundred seventy-three".