645484945850 has 24 divisors (see below), whose sum is σ = 1207309289760. Its totient is φ = 256751550320.

The previous prime is 645484945817. The next prime is 645484945927. The reversal of 645484945850 is 58549484546.

645484945850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36051662 + ... + 36069561.

It is an arithmetic number, because the mean of its divisors is an integer number (50304553740).

Almost surely, 2^645484945850 is an apocalyptic number.

645484945850 is a deficient number, since it is larger than the sum of its proper divisors (561824343910).

645484945850 is a wasteful number, since it uses less digits than its factorization.

645484945850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72121414 (or 72121409 counting only the distinct ones).

The product of its (nonzero) digits is 110592000, while the sum is 62.

The spelling of 645484945850 in words is "six hundred forty-five billion, four hundred eighty-four million, nine hundred forty-five thousand, eight hundred fifty".