646767607 has 2 divisors, whose sum is σ = 646767608. Its totient is φ = 646767606.

The previous prime is 646767587. The next prime is 646767637. The reversal of 646767607 is 706767646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646767607 - 2¹⁵ = 646734839 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 (646767637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323383803 + 323383804.

It is an arithmetic number, because the mean of its divisors is an integer number (323383804).

Almost surely, 2^646767607 is an apocalyptic number.

646767607 is a deficient number, since it is larger than the sum of its proper divisors (1).

646767607 is an equidigital number, since it uses as much as digits as its factorization.

646767607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The square root of 646767607 is about 25431.6261178872. The cubic root of 646767607 is about 864.8008081549.

The spelling of 646767607 in words is "six hundred forty-six million, seven hundred sixty-seven thousand, six hundred seven".