2161662685 has 48 divisors (see below), whose sum is σ = 3280507776. Its totient is φ = 1355260032.

The previous prime is 2161662683. The next prime is 2161662689. The reversal of 2161662685 is 5862661612.

It is not a de Polignac number, because 2161662685 - 2¹ = 2161662683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161662683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 337624 + ... + 343966.

It is an arithmetic number, because the mean of its divisors is an integer number (68343912).

Almost surely, 2^2161662685 is an apocalyptic number.

It is an amenable number.

2161662685 is a deficient number, since it is larger than the sum of its proper divisors (1118845091).

2161662685 is a wasteful number, since it uses less digits than its factorization.

2161662685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6482 (or 6475 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 2161662685 is about 46493.6843560499. The cubic root of 2161662685 is about 1292.9924091583.

The spelling of 2161662685 in words is "two billion, one hundred sixty-one million, six hundred sixty-two thousand, six hundred eighty-five".