645611422012 has 18 divisors (see below), whose sum is σ = 1170122729048. Its totient is φ = 311674477968.

The previous prime is 645611421967. The next prime is 645611422037. The reversal of 645611422012 is 210224116546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95955528 + ... + 95962255.

Almost surely, 2^645611422012 is an apocalyptic number.

It is an amenable number.

645611422012 is a deficient number, since it is larger than the sum of its proper divisors (524511307036).

645611422012 is a wasteful number, since it uses less digits than its factorization.

645611422012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191917845 (or 191917814 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 645611422012 its reverse (210224116546), we get a palindrome (855835538558).

The spelling of 645611422012 in words is "six hundred forty-five billion, six hundred eleven million, four hundred twenty-two thousand, twelve".