2066252521 has 4 divisors (see below), whose sum is σ = 2067149700. Its totient is φ = 2065355344.

The previous prime is 2066252509. The next prime is 2066252533. The reversal of 2066252521 is 1252526602.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2066252509) and next prime (2066252533).

It can be written as a sum of positive squares in 2 ways, for example, as 1826622121 + 239630400 = 42739^2 + 15480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066252521 - 2⁹ = 2066252009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2066202521) 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, 445126 + ... + 449743.

It is an arithmetic number, because the mean of its divisors is an integer number (516787425).

Almost surely, 2^2066252521 is an apocalyptic number.

It is an amenable number.

2066252521 is a deficient number, since it is larger than the sum of its proper divisors (897179).

2066252521 is an equidigital number, since it uses as much as digits as its factorization.

2066252521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897178.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 2066252521 is about 45456.0504333582. The cubic root of 2066252521 is about 1273.6823544507.

The spelling of 2066252521 in words is "two billion, sixty-six million, two hundred fifty-two thousand, five hundred twenty-one".