2165427979 has 12 divisors (see below), whose sum is σ = 2563273888. Its totient is φ = 1817141040.

The previous prime is 2165427949. The next prime is 2165427983. The reversal of 2165427979 is 9797245612.

It is not a de Polignac number, because 2165427979 - 2¹¹ = 2165425931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165427949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686739 + ... + 689884.

Almost surely, 2^2165427979 is an apocalyptic number.

2165427979 is a deficient number, since it is larger than the sum of its proper divisors (397845909).

2165427979 is a wasteful number, since it uses less digits than its factorization.

2165427979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376658 (or 1376647 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 52.

The square root of 2165427979 is about 46534.1592703683. The cubic root of 2165427979 is about 1293.7427070030.

The spelling of 2165427979 in words is "two billion, one hundred sixty-five million, four hundred twenty-seven thousand, nine hundred seventy-nine".