645651849188 has 12 divisors (see below), whose sum is σ = 1146754777392. Its totient is φ = 318007627080.

The previous prime is 645651849173. The next prime is 645651849221. The reversal of 645651849188 is 881948156546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204574078 + ... + 1204574613.

It is an arithmetic number, because the mean of its divisors is an integer number (95562898116).

Almost surely, 2^645651849188 is an apocalyptic number.

It is an amenable number.

645651849188 is a deficient number, since it is larger than the sum of its proper divisors (501102928204).

645651849188 is a wasteful number, since it uses less digits than its factorization.

645651849188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409148762 (or 2409148760 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 65.

The spelling of 645651849188 in words is "six hundred forty-five billion, six hundred fifty-one million, eight hundred forty-nine thousand, one hundred eighty-eight".