2161668570 has 192 divisors, whose sum is σ = 5848174080. Its totient is φ = 509756544.

The previous prime is 2161668511. The next prime is 2161668577. The reversal of 2161668570 is 758661612.

It is a super-2 number, since 2×2161668570² = 9345622013051689800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161668577) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20202457 + ... + 20202563.

It is an arithmetic number, because the mean of its divisors is an integer number (30459240).

Almost surely, 2^2161668570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161668570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2924087040).

2161668570 is an abundant number, since it is smaller than the sum of its proper divisors (3686505510).

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

2161668570 is a wasteful number, since it uses less digits than its factorization.

2161668570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 2161668570 is about 46493.7476441725. The cubic root of 2161668570 is about 1292.9935825226.

The spelling of 2161668570 in words is "two billion, one hundred sixty-one million, six hundred sixty-eight thousand, five hundred seventy".