2171667065 has 4 divisors (see below), whose sum is σ = 2606000484. Its totient is φ = 1737333648.

The previous prime is 2171667053. The next prime is 2171667079. The reversal of 2171667065 is 5607661712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1318851856 + 852815209 = 36316^2 + 29203^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171667065 - 2²² = 2167472761 is a prime.

It is a super-2 number, since 2×2171667065² = 9432275682411428450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217166702 + ... + 217166711.

It is an arithmetic number, because the mean of its divisors is an integer number (651500121).

Almost surely, 2^2171667065 is an apocalyptic number.

It is an amenable number.

2171667065 is a deficient number, since it is larger than the sum of its proper divisors (434333419).

2171667065 is an equidigital number, since it uses as much as digits as its factorization.

2171667065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434333418.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 2171667065 is about 46601.1487519353. The cubic root of 2171667065 is about 1294.9840370120.

The spelling of 2171667065 in words is "two billion, one hundred seventy-one million, six hundred sixty-seven thousand, sixty-five".