2166661270 has 16 divisors (see below), whose sum is σ = 3900733200. Its totient is φ = 866499424.

The previous prime is 2166661267. The next prime is 2166661279. The reversal of 2166661270 is 721666612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166661279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44181 + ... + 79279.

It is an arithmetic number, because the mean of its divisors is an integer number (243795825).

Almost surely, 2^2166661270 is an apocalyptic number.

2166661270 is a deficient number, since it is larger than the sum of its proper divisors (1734071930).

2166661270 is a wasteful number, since it uses less digits than its factorization.

2166661270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41279.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 2166661270 is about 46547.4088430280. The cubic root of 2166661270 is about 1293.9882717655.

The spelling of 2166661270 in words is "two billion, one hundred sixty-six million, six hundred sixty-one thousand, two hundred seventy".