66202025 has 6 divisors (see below), whose sum is σ = 82090542. Its totient is φ = 52961600.

The previous prime is 66202013. The next prime is 66202049. The reversal of 66202025 is 52020266.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 137641 + 66064384 = 371^2 + 8128^2 .

It is not a de Polignac number, because 66202025 - 2⁴ = 66202009 is a prime.

It is a super-2 number, since 2×66202025² = 8765416228201250, 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 5 ways as a sum of consecutive naturals, for example, 1324016 + ... + 1324065.

It is an arithmetic number, because the mean of its divisors is an integer number (13681757).

Almost surely, 2^66202025 is an apocalyptic number.

It is an amenable number.

66202025 is a deficient number, since it is larger than the sum of its proper divisors (15888517).

66202025 is a wasteful number, since it uses less digits than its factorization.

66202025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648091 (or 2648086 counting only the distinct ones).

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

The square root of 66202025 is about 8136.4626835007. The cubic root of 66202025 is about 404.5359212040.

The spelling of 66202025 in words is "sixty-six million, two hundred two thousand, twenty-five".