645399080188 has 12 divisors (see below), whose sum is σ = 1131001969552. Its totient is φ = 322255660320.

The previous prime is 645399080173. The next prime is 645399080191. The reversal of 645399080188 is 881080993546.

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 3 ways as a sum of consecutive naturals, for example, 110966673 + ... + 110972488.

Almost surely, 2^645399080188 is an apocalyptic number.

It is an amenable number.

645399080188 is a deficient number, since it is larger than the sum of its proper divisors (485602889364).

645399080188 is a wasteful number, since it uses less digits than its factorization.

645399080188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221939892 (or 221939890 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 645399080188 in words is "six hundred forty-five billion, three hundred ninety-nine million, eighty thousand, one hundred eighty-eight".