2161665712 has 30 divisors (see below), whose sum is σ = 4327720404. Its totient is φ = 1045959840.

The previous prime is 2161665683. The next prime is 2161665773. The reversal of 2161665712 is 2175661612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54918 + ... + 85669.

Almost surely, 2^2161665712 is an apocalyptic number.

It is an amenable number.

2161665712 is an abundant number, since it is smaller than the sum of its proper divisors (2166054692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161665712 is a wasteful number, since it uses less digits than its factorization.

2161665712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140657 (or 140620 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 2161665712 is about 46493.7169088469. The cubic root of 2161665712 is about 1292.9930126885.

The spelling of 2161665712 in words is "two billion, one hundred sixty-one million, six hundred sixty-five thousand, seven hundred twelve".