2166570823 has 4 divisors (see below), whose sum is σ = 2166701680. Its totient is φ = 2166439968.

The previous prime is 2166570821. The next prime is 2166570841. The reversal of 2166570823 is 3280756612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166570823 - 2¹ = 2166570821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166570821) 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, 36258 + ... + 75151.

It is an arithmetic number, because the mean of its divisors is an integer number (541675420).

Almost surely, 2^2166570823 is an apocalyptic number.

2166570823 is a deficient number, since it is larger than the sum of its proper divisors (130857).

2166570823 is a wasteful number, since it uses less digits than its factorization.

2166570823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130856.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 2166570823 is about 46546.4372750482. The cubic root of 2166570823 is about 1293.9702657229.

The spelling of 2166570823 in words is "two billion, one hundred sixty-six million, five hundred seventy thousand, eight hundred twenty-three".