2164740823 has 4 divisors (see below), whose sum is σ = 2473989520. Its totient is φ = 1855492128.

The previous prime is 2164740821. The next prime is 2164740829. The reversal of 2164740823 is 3280474612.

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

It is not a de Polignac number, because 2164740823 - 2¹ = 2164740821 is a prime.

It is a super-2 number, since 2×2164740823² = 9372205661525434658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164740821) 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, 154624338 + ... + 154624351.

It is an arithmetic number, because the mean of its divisors is an integer number (618497380).

Almost surely, 2^2164740823 is an apocalyptic number.

2164740823 is a deficient number, since it is larger than the sum of its proper divisors (309248697).

2164740823 is an equidigital number, since it uses as much as digits as its factorization.

2164740823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309248696.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 2164740823 is about 46526.7753342094. The cubic root of 2164740823 is about 1293.6058445868.

The spelling of 2164740823 in words is "two billion, one hundred sixty-four million, seven hundred forty thousand, eight hundred twenty-three".