667707473 has 2 divisors, whose sum is σ = 667707474. Its totient is φ = 667707472.

The previous prime is 667707431. The next prime is 667707479. The reversal of 667707473 is 374707766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638471824 + 29235649 = 25268^2 + 5407^2 .

It is a cyclic number.

It is not a de Polignac number, because 667707473 - 2¹⁶ = 667641937 is a prime.

It is equal to p_34665689 and since 667707473 and 34665689 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (667707479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333853736 + 333853737.

It is an arithmetic number, because the mean of its divisors is an integer number (333853737).

Almost surely, 2^667707473 is an apocalyptic number.

It is an amenable number.

667707473 is a deficient number, since it is larger than the sum of its proper divisors (1).

667707473 is an equidigital number, since it uses as much as digits as its factorization.

667707473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1037232, while the sum is 47.

The square root of 667707473 is about 25840.0362422346. The cubic root of 667707473 is about 874.0348423989.

The spelling of 667707473 in words is "six hundred sixty-seven million, seven hundred seven thousand, four hundred seventy-three".