645635250441 has 12 divisors (see below), whose sum is σ = 967124408432. Its totient is φ = 430423500132.

The previous prime is 645635250437. The next prime is 645635250443. The reversal of 645635250441 is 144052536546.

645635250441 is a `hidden beast` number, since 6 + 4 + 5 + 635 + 2 + 5 + 0 + 4 + 4 + 1 = 666.

It is not a de Polignac number, because 645635250441 - 2² = 645635250437 is a prime.

It is a super-3 number, since 3×645635250441³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645635250443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328467351 + ... + 1328467836.

Almost surely, 2^645635250441 is an apocalyptic number.

It is an amenable number.

645635250441 is a deficient number, since it is larger than the sum of its proper divisors (321489157991).

645635250441 is an equidigital number, since it uses as much as digits as its factorization.

645635250441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656935202 (or 2656935190 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

Adding to 645635250441 its reverse (144052536546), we get a palindrome (789687786987).

The spelling of 645635250441 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred fifty thousand, four hundred forty-one".