645839451445 has 8 divisors (see below), whose sum is σ = 775012278744. Its totient is φ = 516668269824.

The previous prime is 645839451409. The next prime is 645839451493. The reversal of 645839451445 is 544154938546.

It can be written as a sum of positive squares in 4 ways, for example, as 48276438961 + 597563012484 = 219719^2 + 773022^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645839451445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645839451445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750057 + ... + 1361713.

It is an arithmetic number, because the mean of its divisors is an integer number (96876534843).

Almost surely, 2^645839451445 is an apocalyptic number.

It is an amenable number.

645839451445 is a deficient number, since it is larger than the sum of its proper divisors (129172827299).

645839451445 is a wasteful number, since it uses less digits than its factorization.

645839451445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822839.

The product of its digits is 41472000, while the sum is 58.

The spelling of 645839451445 in words is "six hundred forty-five billion, eight hundred thirty-nine million, four hundred fifty-one thousand, four hundred forty-five".