645994603356 has 48 divisors (see below), whose sum is σ = 1526968020480. Its totient is φ = 212542948800.

The previous prime is 645994603349. The next prime is 645994603361. The reversal of 645994603356 is 653306499546.

It is a self number, because there is not a number n which added to its sum of digits gives 645994603356.

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 15 ways as a sum of consecutive naturals, for example, 850896 + ... + 1419863.

It is an arithmetic number, because the mean of its divisors is an integer number (31811833760).

Almost surely, 2^645994603356 is an apocalyptic number.

It is an amenable number.

645994603356 is an abundant number, since it is smaller than the sum of its proper divisors (880973417124).

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

645994603356 is a wasteful number, since it uses less digits than its factorization.

645994603356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271074 (or 2271072 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 60.

The spelling of 645994603356 in words is "six hundred forty-five billion, nine hundred ninety-four million, six hundred three thousand, three hundred fifty-six".