645144355250 has 32 divisors (see below), whose sum is σ = 1209305977776. Its totient is φ = 257716771200.

The previous prime is 645144355237. The next prime is 645144355253. The reversal of 645144355250 is 52553441546.

It can be written as a sum of positive squares in 8 ways, for example, as 8227034209 + 636917321041 = 90703^2 + 798071^2 .

It is a super-3 number, since 3×645144355250³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (645144355253) 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 in 15 ways as a sum of consecutive naturals, for example, 1515227 + ... + 1893726.

Almost surely, 2^645144355250 is an apocalyptic number.

645144355250 is a deficient number, since it is larger than the sum of its proper divisors (564161622526).

645144355250 is a wasteful number, since it uses less digits than its factorization.

645144355250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409727 (or 3409717 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 44.

Adding to 645144355250 its reverse (52553441546), we get a palindrome (697697796796).

The spelling of 645144355250 in words is "six hundred forty-five billion, one hundred forty-four million, three hundred fifty-five thousand, two hundred fifty".