645660043160 has 32 divisors (see below), whose sum is σ = 1584801925200. Its totient is φ = 234785470080.

The previous prime is 645660043139. The next prime is 645660043207. The reversal of 645660043160 is 61340066546.

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 7 ways as a sum of consecutive naturals, for example, 733704155 + ... + 733705034.

Almost surely, 2^645660043160 is an apocalyptic number.

It is an amenable number.

645660043160 is an abundant number, since it is smaller than the sum of its proper divisors (939141882040).

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

645660043160 is a wasteful number, since it uses less digits than its factorization.

645660043160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467409211 (or 1467409207 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 645660043160 in words is "six hundred forty-five billion, six hundred sixty million, forty-three thousand, one hundred sixty".