667765783 has 2 divisors, whose sum is σ = 667765784. Its totient is φ = 667765782.

The previous prime is 667765741. The next prime is 667765807. The reversal of 667765783 is 387567766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667765783 - 2⁹ = 667765271 is a prime.

It is a super-2 number, since 2×667765783² = 891822281891206178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667765183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333882891 + 333882892.

It is an arithmetic number, because the mean of its divisors is an integer number (333882892).

Almost surely, 2^667765783 is an apocalyptic number.

667765783 is a deficient number, since it is larger than the sum of its proper divisors (1).

667765783 is an equidigital number, since it uses as much as digits as its factorization.

667765783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 55.

The square root of 667765783 is about 25841.1645054939. The cubic root of 667765783 is about 874.0602844226.

The spelling of 667765783 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, seven hundred eighty-three".