2165680919 has 2 divisors, whose sum is σ = 2165680920. Its totient is φ = 2165680918.

The previous prime is 2165680889. The next prime is 2165680931. The reversal of 2165680919 is 9190865612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165680919 - 2²⁴ = 2148903703 is a prime.

It is a super-2 number, since 2×2165680919² = 9380347685841369122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165680619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082840459 + 1082840460.

It is an arithmetic number, because the mean of its divisors is an integer number (1082840460).

Almost surely, 2^2165680919 is an apocalyptic number.

2165680919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165680919 is an equidigital number, since it uses as much as digits as its factorization.

2165680919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 2165680919 is about 46536.8769794450. The cubic root of 2165680919 is about 1293.7930783450.

The spelling of 2165680919 in words is "two billion, one hundred sixty-five million, six hundred eighty thousand, nine hundred nineteen".