2171665930 has 32 divisors (see below), whose sum is σ = 4469769216. Its totient is φ = 744180864.

The previous prime is 2171665927. The next prime is 2171665939. The reversal of 2171665930 is 395661712.

It is a super-2 number, since 2×2171665930² = 9432265823045529800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2171665939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147462 + ... + 161518.

It is an arithmetic number, because the mean of its divisors is an integer number (139680288).

Almost surely, 2^2171665930 is an apocalyptic number.

2171665930 is an abundant number, since it is smaller than the sum of its proper divisors (2298103286).

2171665930 is a wasteful number, since it uses less digits than its factorization.

2171665930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16278.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 2171665930 is about 46601.1365741223. The cubic root of 2171665930 is about 1294.9838114085.

The spelling of 2171665930 in words is "two billion, one hundred seventy-one million, six hundred sixty-five thousand, nine hundred thirty".