645601566241 has 8 divisors (see below), whose sum is σ = 654001824960. Its totient is φ = 637246349712.

The previous prime is 645601566229. The next prime is 645601566251. The reversal of 645601566241 is 142665106546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645601566241 - 2²¹ = 645599469089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645601566191 and 645601566200.

It is not an unprimeable number, because it can be changed into a prime (645601566251) 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 7 ways as a sum of consecutive naturals, for example, 11231695 + ... + 11289028.

It is an arithmetic number, because the mean of its divisors is an integer number (81750228120).

Almost surely, 2^645601566241 is an apocalyptic number.

It is an amenable number.

645601566241 is a deficient number, since it is larger than the sum of its proper divisors (8400258719).

645601566241 is a wasteful number, since it uses less digits than its factorization.

645601566241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22521095.

The product of its (nonzero) digits is 1036800, while the sum is 46.

It can be divided in two parts, 6456015 and 66241, that added together give a palindrome (6522256).

The spelling of 645601566241 in words is "six hundred forty-five billion, six hundred one million, five hundred sixty-six thousand, two hundred forty-one".