646260691 has 2 divisors, whose sum is σ = 646260692. Its totient is φ = 646260690.

The previous prime is 646260617. The next prime is 646260697. The reversal of 646260691 is 196062646.

646260691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646260691 - 2⁹ = 646260179 is a prime.

It is not a weakly prime, because it can be changed into another prime (646260697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323130345 + 323130346.

It is an arithmetic number, because the mean of its divisors is an integer number (323130346).

Almost surely, 2^646260691 is an apocalyptic number.

646260691 is a deficient number, since it is larger than the sum of its proper divisors (1).

646260691 is an equidigital number, since it uses as much as digits as its factorization.

646260691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 646260691 is about 25421.6579121032. The cubic root of 646260691 is about 864.5748145927.

The spelling of 646260691 in words is "six hundred forty-six million, two hundred sixty thousand, six hundred ninety-one".