2199536661 has 16 divisors (see below), whose sum is σ = 3353982464. Its totient is φ = 1256012784.

The previous prime is 2199536641. The next prime is 2199536683. The reversal of 2199536661 is 1666359912.

It is a happy number.

It is not a de Polignac number, because 2199536661 - 2⁷ = 2199536533 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2199536661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199536641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4171 + ... + 66456.

It is an arithmetic number, because the mean of its divisors is an integer number (209623904).

Almost surely, 2^2199536661 is an apocalyptic number.

2199536661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2199536661 is a deficient number, since it is larger than the sum of its proper divisors (1154445803).

2199536661 is a wasteful number, since it uses less digits than its factorization.

2199536661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72120.

The product of its digits is 524880, while the sum is 48.

The square root of 2199536661 is about 46899.2181278110. The cubic root of 2199536661 is about 1300.5001351770.

The spelling of 2199536661 in words is "two billion, one hundred ninety-nine million, five hundred thirty-six thousand, six hundred sixty-one".