2166996613 has 4 divisors (see below), whose sum is σ = 2294467020. Its totient is φ = 2039526208.

The previous prime is 2166996583. The next prime is 2166996661. The reversal of 2166996613 is 3166996612.

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 798514564 + 1368482049 = 28258^2 + 36993^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166996613 - 2¹⁷ = 2166865541 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166996673) 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, 63735178 + ... + 63735211.

It is an arithmetic number, because the mean of its divisors is an integer number (573616755).

Almost surely, 2^2166996613 is an apocalyptic number.

It is an amenable number.

2166996613 is a deficient number, since it is larger than the sum of its proper divisors (127470407).

2166996613 is a wasteful number, since it uses less digits than its factorization.

2166996613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127470406.

The product of its digits is 629856, while the sum is 49.

The square root of 2166996613 is about 46551.0108697974. The cubic root of 2166996613 is about 1294.0550269355.

Subtracting 2166996613 from its reverse (3166996612), we obtain a palindrome (999999999).

The spelling of 2166996613 in words is "two billion, one hundred sixty-six million, nine hundred ninety-six thousand, six hundred thirteen".