645731630360291 has 2 divisors, whose sum is σ = 645731630360292. Its totient is φ = 645731630360290.

The previous prime is 645731630360237. The next prime is 645731630360417. The reversal of 645731630360291 is 192063036137546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645731630360291 - 2⁴⁶ = 575362886182627 is a prime.

It is not a weakly prime, because it can be changed into another prime (645731630360221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322865815180145 + 322865815180146.

It is an arithmetic number, because the mean of its divisors is an integer number (322865815180146).

Almost surely, 2^{645731630360291} is an apocalyptic number.

645731630360291 is a deficient number, since it is larger than the sum of its proper divisors (1).

645731630360291 is an equidigital number, since it uses as much as digits as its factorization.

645731630360291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 645731630360291 in words is "six hundred forty-five trillion, seven hundred thirty-one billion, six hundred thirty million, three hundred sixty thousand, two hundred ninety-one".