645839911351 has 2 divisors, whose sum is σ = 645839911352. Its totient is φ = 645839911350.

The previous prime is 645839911279. The next prime is 645839911361. The reversal of 645839911351 is 153119938546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645839911351 - 2²⁷ = 645705693623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645839911292 and 645839911301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645839911361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322919955675 + 322919955676.

It is an arithmetic number, because the mean of its divisors is an integer number (322919955676).

Almost surely, 2^645839911351 is an apocalyptic number.

645839911351 is a deficient number, since it is larger than the sum of its proper divisors (1).

645839911351 is an equidigital number, since it uses as much as digits as its factorization.

645839911351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3499200, while the sum is 55.

The spelling of 645839911351 in words is "six hundred forty-five billion, eight hundred thirty-nine million, nine hundred eleven thousand, three hundred fifty-one".