645351426100263 has 16 divisors (see below), whose sum is σ = 860587301831936. Its totient is φ = 430174918635840.

The previous prime is 645351426100253. The next prime is 645351426100313. The reversal of 645351426100263 is 362001624153546.

It is not a de Polignac number, because 645351426100263 - 2³² = 645347131132967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645351426100253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2817681756 + ... + 2817910782.

It is an arithmetic number, because the mean of its divisors is an integer number (53786706364496).

Almost surely, 2^{645351426100263} is an apocalyptic number.

645351426100263 is a deficient number, since it is larger than the sum of its proper divisors (215235875731673).

645351426100263 is a wasteful number, since it uses less digits than its factorization.

645351426100263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354534.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 645351426100263 in words is "six hundred forty-five trillion, three hundred fifty-one billion, four hundred twenty-six million, one hundred thousand, two hundred sixty-three".