2161696499 has 4 divisors (see below), whose sum is σ = 2161904136. Its totient is φ = 2161488864.

The previous prime is 2161696487. The next prime is 2161696517. The reversal of 2161696499 is 9946961612.

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 2161696499 - 2⁴ = 2161696483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161696499.

It is not an unprimeable number, because it can be changed into a prime (2161696799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87329 + ... + 109314.

It is an arithmetic number, because the mean of its divisors is an integer number (540476034).

Almost surely, 2^2161696499 is an apocalyptic number.

2161696499 is a deficient number, since it is larger than the sum of its proper divisors (207637).

2161696499 is a wasteful number, since it uses less digits than its factorization.

2161696499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207636.

The product of its digits is 1259712, while the sum is 53.

The square root of 2161696499 is about 46494.0479954155. The cubic root of 2161696499 is about 1292.9991510392. Note that the first 3 decimals are identical.

The spelling of 2161696499 in words is "two billion, one hundred sixty-one million, six hundred ninety-six thousand, four hundred ninety-nine".