647275667 has 2 divisors, whose sum is σ = 647275668. Its totient is φ = 647275666.

The previous prime is 647275523. The next prime is 647275687. The reversal of 647275667 is 766572746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647275667 - 2⁸ = 647275411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647275687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323637833 + 323637834.

It is an arithmetic number, because the mean of its divisors is an integer number (323637834).

Almost surely, 2^647275667 is an apocalyptic number.

647275667 is a deficient number, since it is larger than the sum of its proper divisors (1).

647275667 is an equidigital number, since it uses as much as digits as its factorization.

647275667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 50.

The square root of 647275667 is about 25441.6129009149. The cubic root of 647275667 is about 865.0271932823.

The spelling of 647275667 in words is "six hundred forty-seven million, two hundred seventy-five thousand, six hundred sixty-seven".