667733399 has 2 divisors, whose sum is σ = 667733400. Its totient is φ = 667733398.

The previous prime is 667733351. The next prime is 667733419. The reversal of 667733399 is 993337766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667733399 is a prime.

It is a Chen prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 667733399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667733329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333866699 + 333866700.

It is an arithmetic number, because the mean of its divisors is an integer number (333866700).

Almost surely, 2^667733399 is an apocalyptic number.

667733399 is a deficient number, since it is larger than the sum of its proper divisors (1).

667733399 is an equidigital number, since it uses as much as digits as its factorization.

667733399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 53.

The square root of 667733399 is about 25840.5379007481. The cubic root of 667733399 is about 874.0461547050.

The spelling of 667733399 in words is "six hundred sixty-seven million, seven hundred thirty-three thousand, three hundred ninety-nine".