2165012723 has 4 divisors (see below), whose sum is σ = 2186032368. Its totient is φ = 2143993080.

The previous prime is 2165012711. The next prime is 2165012771. The reversal of 2165012723 is 3272105612.

It is a happy number.

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 2165012723 - 2¹² = 2165008627 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165012123) 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, 10509668 + ... + 10509873.

It is an arithmetic number, because the mean of its divisors is an integer number (546508092).

Almost surely, 2^2165012723 is an apocalyptic number.

2165012723 is a deficient number, since it is larger than the sum of its proper divisors (21019645).

2165012723 is a wasteful number, since it uses less digits than its factorization.

2165012723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21019644.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 2165012723 is about 46529.6972158642. The cubic root of 2165012723 is about 1293.6600029877.

The spelling of 2165012723 in words is "two billion, one hundred sixty-five million, twelve thousand, seven hundred twenty-three".