2066165641 has 4 divisors (see below), whose sum is σ = 2068895812. Its totient is φ = 2063435472.

The previous prime is 2066165617. The next prime is 2066165707. The reversal of 2066165641 is 1465616602.

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 1207910025 + 858255616 = 34755^2 + 29296^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066165641 - 2⁷ = 2066165513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2066165641.

It is not an unprimeable number, because it can be changed into a prime (2066165041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363950 + ... + 1365463.

It is an arithmetic number, because the mean of its divisors is an integer number (517223953).

Almost surely, 2^2066165641 is an apocalyptic number.

It is an amenable number.

2066165641 is a deficient number, since it is larger than the sum of its proper divisors (2730171).

2066165641 is an equidigital number, since it uses as much as digits as its factorization.

2066165641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730170.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2066165641 is about 45455.0947749534. The cubic root of 2066165641 is about 1273.6645026356.

The spelling of 2066165641 in words is "two billion, sixty-six million, one hundred sixty-five thousand, six hundred forty-one".