645236445365 has 8 divisors (see below), whose sum is σ = 774385968600. Its totient is φ = 516121000192.

The previous prime is 645236445319. The next prime is 645236445367. The reversal of 645236445365 is 563544632546.

645236445365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 45480680644 + 599755764721 = 213262^2 + 774439^2 .

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 645236445365 - 2¹⁰ = 645236444341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645236445367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8477840 + ... + 8553609.

It is an arithmetic number, because the mean of its divisors is an integer number (96798246075).

Almost surely, 2^645236445365 is an apocalyptic number.

It is an amenable number.

645236445365 is a deficient number, since it is larger than the sum of its proper divisors (129149523235).

645236445365 is a wasteful number, since it uses less digits than its factorization.

645236445365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17039031.

The product of its digits is 31104000, while the sum is 53.

The spelling of 645236445365 in words is "six hundred forty-five billion, two hundred thirty-six million, four hundred forty-five thousand, three hundred sixty-five".