4215845661 has 4 divisors (see below), whose sum is σ = 5621127552. Its totient is φ = 2810563772.

The previous prime is 4215845653. The next prime is 4215845687. The reversal of 4215845661 is 1665485124.

4215845661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4215845661 - 2³ = 4215845653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4215845561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702640941 + ... + 702640946.

It is an arithmetic number, because the mean of its divisors is an integer number (1405281888).

Almost surely, 2^4215845661 is an apocalyptic number.

It is an amenable number.

4215845661 is a deficient number, since it is larger than the sum of its proper divisors (1405281891).

4215845661 is a wasteful number, since it uses less digits than its factorization.

4215845661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405281890.

The product of its digits is 230400, while the sum is 42.

The square root of 4215845661 is about 64929.5438225158. The cubic root of 4215845661 is about 1615.4551348490.

The spelling of 4215845661 in words is "four billion, two hundred fifteen million, eight hundred forty-five thousand, six hundred sixty-one".