4243501645 has 8 divisors (see below), whose sum is σ = 5095621656. Its totient is φ = 3392521536.

The previous prime is 4243501609. The next prime is 4243501649. The reversal of 4243501645 is 5461053424.

It can be written as a sum of positive squares in 4 ways, for example, as 2498100361 + 1745401284 = 49981^2 + 41778^2 .

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-4243501645 is a prime.

It is a super-3 number, since 3×4243501645³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 4243501645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243501649) 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, 276762 + ... + 291691.

It is an arithmetic number, because the mean of its divisors is an integer number (636952707).

Almost surely, 2^4243501645 is an apocalyptic number.

It is an amenable number.

4243501645 is a deficient number, since it is larger than the sum of its proper divisors (852120011).

4243501645 is a wasteful number, since it uses less digits than its factorization.

4243501645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569951.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 4243501645 is about 65142.1648780573. The cubic root of 4243501645 is about 1618.9799050928.

The spelling of 4243501645 in words is "four billion, two hundred forty-three million, five hundred one thousand, six hundred forty-five".