2165759797 has 4 divisors (see below), whose sum is σ = 2165906476. Its totient is φ = 2165613120.

The previous prime is 2165759779. The next prime is 2165759803. The reversal of 2165759797 is 7979575612.

2165759797 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1147447876 + 1018311921 = 33874^2 + 31911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165759797 - 2¹⁹ = 2165235509 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 (2165759767) 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, 48354 + ... + 81667.

It is an arithmetic number, because the mean of its divisors is an integer number (541476619).

Almost surely, 2^2165759797 is an apocalyptic number.

It is an amenable number.

2165759797 is a deficient number, since it is larger than the sum of its proper divisors (146679).

2165759797 is a wasteful number, since it uses less digits than its factorization.

2165759797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146678.

The product of its digits is 8334900, while the sum is 58.

The square root of 2165759797 is about 46537.7244501705. The cubic root of 2165759797 is about 1293.8087855791.

The spelling of 2165759797 in words is "two billion, one hundred sixty-five million, seven hundred fifty-nine thousand, seven hundred ninety-seven".