2209802661 has 16 divisors (see below), whose sum is σ = 3571398720. Its totient is φ = 1339274160.

The previous prime is 2209802659. The next prime is 2209802663. The reversal of 2209802661 is 1662089022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2209802659) and next prime (2209802663).

It is not a de Polignac number, because 2209802661 - 2¹ = 2209802659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209802663) 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 15 ways as a sum of consecutive naturals, for example, 3719910 + ... + 3720503.

It is an arithmetic number, because the mean of its divisors is an integer number (223212420).

Almost surely, 2^2209802661 is an apocalyptic number.

It is an amenable number.

2209802661 is a deficient number, since it is larger than the sum of its proper divisors (1361596059).

2209802661 is a wasteful number, since it uses less digits than its factorization.

2209802661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7440433 (or 7440427 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2209802661 is about 47008.5381712727. The cubic root of 2209802661 is about 1302.5202904776.

The spelling of 2209802661 in words is "two billion, two hundred nine million, eight hundred two thousand, six hundred sixty-one".