2116420665 has 32 divisors (see below), whose sum is σ = 3439687680. Its totient is φ = 1111041984.

The previous prime is 2116420651. The next prime is 2116420703. The reversal of 2116420665 is 5660246112.

It is not a de Polignac number, because 2116420665 - 2⁹ = 2116420153 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408622 + ... + 413768.

It is an arithmetic number, because the mean of its divisors is an integer number (107490240).

Almost surely, 2^2116420665 is an apocalyptic number.

It is an amenable number.

2116420665 is a deficient number, since it is larger than the sum of its proper divisors (1323267015).

2116420665 is a wasteful number, since it uses less digits than its factorization.

2116420665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2116420665 is about 46004.5722184219. The cubic root of 2116420665 is about 1283.9082744959.

Adding to 2116420665 its reverse (5660246112), we get a palindrome (7776666777).

The spelling of 2116420665 in words is "two billion, one hundred sixteen million, four hundred twenty thousand, six hundred sixty-five".