2161666202 has 4 divisors (see below), whose sum is σ = 3242499306. Its totient is φ = 1080833100.

The previous prime is 2161666189. The next prime is 2161666219. The reversal of 2161666202 is 2026661612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1104831121 + 1056835081 = 33239^2 + 32509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540416549 + ... + 540416552.

Almost surely, 2^2161666202 is an apocalyptic number.

2161666202 is a deficient number, since it is larger than the sum of its proper divisors (1080833104).

2161666202 is a wasteful number, since it uses less digits than its factorization.

2161666202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080833103.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2161666202 is about 46493.7221783759. The cubic root of 2161666202 is about 1292.9931103857.

The spelling of 2161666202 in words is "two billion, one hundred sixty-one million, six hundred sixty-six thousand, two hundred two".