645133512032 has 24 divisors (see below), whose sum is σ = 1279244068200. Its totient is φ = 320246129664.

The previous prime is 645133511927. The next prime is 645133512061. The reversal of 645133512032 is 230215331546.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 645133511983 and 645133512001.

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, 72515057 + ... + 72523952.

It is an arithmetic number, because the mean of its divisors is an integer number (53301836175).

Almost surely, 2^645133512032 is an apocalyptic number.

It is an amenable number.

645133512032 is a deficient number, since it is larger than the sum of its proper divisors (634110556168).

645133512032 is a wasteful number, since it uses less digits than its factorization.

645133512032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145039158 (or 145039150 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 645133512032 its reverse (230215331546), we get a palindrome (875348843578).

The spelling of 645133512032 in words is "six hundred forty-five billion, one hundred thirty-three million, five hundred twelve thousand, thirty-two".