645304341656 has 16 divisors (see below), whose sum is σ = 1303018382400. Its totient is φ = 297832773024.

The previous prime is 645304341631. The next prime is 645304341667. The reversal of 645304341656 is 656143403546.

It is a self number, because there is not a number n which added to its sum of digits gives 645304341656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3102424616 + ... + 3102424823.

It is an arithmetic number, because the mean of its divisors is an integer number (81438648900).

Almost surely, 2^645304341656 is an apocalyptic number.

It is an amenable number.

645304341656 is an abundant number, since it is smaller than the sum of its proper divisors (657714040744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645304341656 is a wasteful number, since it uses less digits than its factorization.

645304341656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6204849458 (or 6204849454 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 645304341656 in words is "six hundred forty-five billion, three hundred four million, three hundred forty-one thousand, six hundred fifty-six".