645632213236 has 6 divisors (see below), whose sum is σ = 1129856373170. Its totient is φ = 322816106616.

The previous prime is 645632213231. The next prime is 645632213263. The reversal of 645632213236 is 632312236546.

It can be written as a sum of positive squares in only one way, i.e., 444115616400 + 201516596836 = 666420^2 + 448906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645632213192 and 645632213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645632213231) by changing a digit.

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 as a sum of consecutive naturals, namely, 80704026651 + ... + 80704026658.

Almost surely, 2^645632213236 is an apocalyptic number.

It is an amenable number.

645632213236 is a deficient number, since it is larger than the sum of its proper divisors (484224159934).

645632213236 is a wasteful number, since it uses less digits than its factorization.

645632213236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161408053313 (or 161408053311 counting only the distinct ones).

The product of its digits is 933120, while the sum is 43.

The spelling of 645632213236 in words is "six hundred forty-five billion, six hundred thirty-two million, two hundred thirteen thousand, two hundred thirty-six".