209282331661 has 16 divisors (see below), whose sum is σ = 226274408640. Its totient is φ = 192418450560.

The previous prime is 209282331641. The next prime is 209282331673. The reversal of 209282331661 is 166133282902.

It is a cyclic number.

It is not a de Polignac number, because 209282331661 - 2⁹ = 209282331149 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 (209282331611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10287646 + ... + 10307968.

It is an arithmetic number, because the mean of its divisors is an integer number (14142150540).

Almost surely, 2^209282331661 is an apocalyptic number.

It is an amenable number.

209282331661 is a deficient number, since it is larger than the sum of its proper divisors (16992076979).

209282331661 is a wasteful number, since it uses less digits than its factorization.

209282331661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23436.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 209282331661 in words is "two hundred nine billion, two hundred eighty-two million, three hundred thirty-one thousand, six hundred sixty-one".