645831305740 has 24 divisors (see below), whose sum is σ = 1376488218672. Its totient is φ = 254476812480.

The previous prime is 645831305729. The next prime is 645831305761. The reversal of 645831305740 is 47503138546.

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, 240980491 + ... + 240983170.

It is an arithmetic number, because the mean of its divisors is an integer number (57353675778).

Almost surely, 2^645831305740 is an apocalyptic number.

It is an amenable number.

645831305740 is an abundant number, since it is smaller than the sum of its proper divisors (730656912932).

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

645831305740 is a wasteful number, since it uses less digits than its factorization.

645831305740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481963737 (or 481963735 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 645831305740 in words is "six hundred forty-five billion, eight hundred thirty-one million, three hundred five thousand, seven hundred forty".