645304135006643 has 16 divisors (see below), whose sum is σ = 762924816783360. Its totient is φ = 534042231021600.

The previous prime is 645304135006561. The next prime is 645304135006691. The reversal of 645304135006643 is 346600531403546.

It is not a de Polignac number, because 645304135006643 - 2⁸ = 645304135006387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645304135006591 and 645304135006600.

It is not an unprimeable number, because it can be changed into a prime (645304135036643) 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, 35221658 + ... + 50310768.

It is an arithmetic number, because the mean of its divisors is an integer number (47682801048960).

Almost surely, 2^{645304135006643} is an apocalyptic number.

645304135006643 is a deficient number, since it is larger than the sum of its proper divisors (117620681776717).

645304135006643 is a wasteful number, since it uses less digits than its factorization.

645304135006643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15299818.

The product of its (nonzero) digits is 9331200, while the sum is 50.

The spelling of 645304135006643 in words is "six hundred forty-five trillion, three hundred four billion, one hundred thirty-five million, six thousand, six hundred forty-three".