646647607 has 2 divisors, whose sum is σ = 646647608. Its totient is φ = 646647606.

The previous prime is 646647587. The next prime is 646647643. The reversal of 646647607 is 706746646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646647607 - 2¹⁹ = 646123319 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 (646647697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323323803 + 323323804.

It is an arithmetic number, because the mean of its divisors is an integer number (323323804).

Almost surely, 2^646647607 is an apocalyptic number.

646647607 is a deficient number, since it is larger than the sum of its proper divisors (1).

646647607 is an equidigital number, since it uses as much as digits as its factorization.

646647607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The square root of 646647607 is about 25429.2667412963. The cubic root of 646647607 is about 864.7473203618.

The spelling of 646647607 in words is "six hundred forty-six million, six hundred forty-seven thousand, six hundred seven".