2161766706 has 64 divisors (see below), whose sum is σ = 4791661056. Its totient is φ = 644716800.

The previous prime is 2161766671. The next prime is 2161766707. The reversal of 2161766706 is 6076671612.

It is a super-3 number, since 3×2161766706³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161766707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1845501 + ... + 1846671.

It is an arithmetic number, because the mean of its divisors is an integer number (74869704).

Almost surely, 2^2161766706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161766706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2395830528).

2161766706 is an abundant number, since it is smaller than the sum of its proper divisors (2629894350).

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

2161766706 is a wasteful number, since it uses less digits than its factorization.

2161766706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 2161766706 is about 46494.8029999053. The cubic root of 2161766706 is about 1293.0131487811.

It can be divided in two parts, 2161 and 766706, that added together give a palindrome (768867).

The spelling of 2161766706 in words is "two billion, one hundred sixty-one million, seven hundred sixty-six thousand, seven hundred six".