66252020 has 12 divisors (see below), whose sum is σ = 139129284. Its totient is φ = 26500800.

The previous prime is 66252001. The next prime is 66252041. The reversal of 66252020 is 2025266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16859236 + 49392784 = 4106^2 + 7028^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 1656281 + ... + 1656320.

It is an arithmetic number, because the mean of its divisors is an integer number (11594107).

Almost surely, 2^66252020 is an apocalyptic number.

It is an amenable number.

66252020 is an abundant number, since it is smaller than the sum of its proper divisors (72877264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66252020 is a wasteful number, since it uses less digits than its factorization.

66252020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312610 (or 3312608 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 66252020 is about 8139.5343847176. The cubic root of 66252020 is about 404.6377291892.

Adding to 66252020 its reverse (2025266), we get a palindrome (68277286).

The spelling of 66252020 in words is "sixty-six million, two hundred fifty-two thousand, twenty".