645132044212 has 12 divisors (see below), whose sum is σ = 1131243568000. Its totient is φ = 321919596216.

The previous prime is 645132044197. The next prime is 645132044237. The reversal of 645132044212 is 212440231546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161604228 + ... + 161608219.

Almost surely, 2^645132044212 is an apocalyptic number.

It is an amenable number.

645132044212 is a deficient number, since it is larger than the sum of its proper divisors (486111523788).

645132044212 is a wasteful number, since it uses less digits than its factorization.

645132044212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323212950 (or 323212948 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 645132044212 its reverse (212440231546), we get a palindrome (857572275758).

The spelling of 645132044212 in words is "six hundred forty-five billion, one hundred thirty-two million, forty-four thousand, two hundred twelve".