645257677223 has 2 divisors, whose sum is σ = 645257677224. Its totient is φ = 645257677222.

The previous prime is 645257677193. The next prime is 645257677313. The reversal of 645257677223 is 322776752546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645257677223 - 2²⁰ = 645256628647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645257677523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322628838611 + 322628838612.

It is an arithmetic number, because the mean of its divisors is an integer number (322628838612).

Almost surely, 2^645257677223 is an apocalyptic number.

645257677223 is a deficient number, since it is larger than the sum of its proper divisors (1).

645257677223 is an equidigital number, since it uses as much as digits as its factorization.

645257677223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29635200, while the sum is 56.

The spelling of 645257677223 in words is "six hundred forty-five billion, two hundred fifty-seven million, six hundred seventy-seven thousand, two hundred twenty-three".