667718783 has 2 divisors, whose sum is σ = 667718784. Its totient is φ = 667718782.

The previous prime is 667718771. The next prime is 667718791. The reversal of 667718783 is 387817766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667718783 - 2¹² = 667714687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667712783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333859391 + 333859392.

It is an arithmetic number, because the mean of its divisors is an integer number (333859392).

Almost surely, 2^667718783 is an apocalyptic number.

667718783 is a deficient number, since it is larger than the sum of its proper divisors (1).

667718783 is an equidigital number, since it uses as much as digits as its factorization.

667718783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 53.

The square root of 667718783 is about 25840.2550877502. The cubic root of 667718783 is about 874.0397773335.

The spelling of 667718783 in words is "six hundred sixty-seven million, seven hundred eighteen thousand, seven hundred eighty-three".