2065212661 has 4 divisors (see below), whose sum is σ = 2075696172. Its totient is φ = 2054729152.

The previous prime is 2065212637. The next prime is 2065212673. The reversal of 2065212661 is 1662125602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1662125602 = 2 ⋅831062801.

It can be written as a sum of positive squares in 2 ways, for example, as 1113490161 + 951722500 = 33369^2 + 30850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065212661 - 2⁷ = 2065212533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065212601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5241460 + ... + 5241853.

It is an arithmetic number, because the mean of its divisors is an integer number (518924043).

Almost surely, 2^2065212661 is an apocalyptic number.

It is an amenable number.

2065212661 is a deficient number, since it is larger than the sum of its proper divisors (10483511).

2065212661 is a wasteful number, since it uses less digits than its factorization.

2065212661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10483510.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2065212661 is about 45444.6109126264. The cubic root of 2065212661 is about 1273.4686545984.

The spelling of 2065212661 in words is "two billion, sixty-five million, two hundred twelve thousand, six hundred sixty-one".