645101605443 has 8 divisors (see below), whose sum is σ = 865412379328. Its totient is φ = 427429284264.

The previous prime is 645101605433. The next prime is 645101605507. The reversal of 645101605443 is 344506101546.

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

It is not a de Polignac number, because 645101605443 - 2¹³ = 645101597251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645101605433) 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, 659612605 + ... + 659613582.

It is an arithmetic number, because the mean of its divisors is an integer number (108176547416).

Almost surely, 2^645101605443 is an apocalyptic number.

645101605443 is a deficient number, since it is larger than the sum of its proper divisors (220310773885).

645101605443 is a wasteful number, since it uses less digits than its factorization.

645101605443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319226353.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 645101605443 its reverse (344506101546), we get a palindrome (989607706989).

The spelling of 645101605443 in words is "six hundred forty-five billion, one hundred one million, six hundred five thousand, four hundred forty-three".