2202691661 has 4 divisors (see below), whose sum is σ = 2203513500. Its totient is φ = 2201869824.

The previous prime is 2202691633. The next prime is 2202691697. The reversal of 2202691661 is 1661962022.

It is a happy number.

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 58446025 + 2144245636 = 7645^2 + 46306^2 .

It is a cyclic number.

It is not a de Polignac number, because 2202691661 - 2⁶ = 2202691597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2202691961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406886 + ... + 412263.

It is an arithmetic number, because the mean of its divisors is an integer number (550878375).

Almost surely, 2^2202691661 is an apocalyptic number.

It is an amenable number.

2202691661 is a deficient number, since it is larger than the sum of its proper divisors (821839).

2202691661 is an equidigital number, since it uses as much as digits as its factorization.

2202691661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821838.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 2202691661 is about 46932.8420298622. The cubic root of 2202691661 is about 1301.1216475395.

The spelling of 2202691661 in words is "two billion, two hundred two million, six hundred ninety-one thousand, six hundred sixty-one".