66525205 has 4 divisors (see below), whose sum is σ = 79830252. Its totient is φ = 53220160.

The previous prime is 66525203. The next prime is 66525209. The reversal of 66525205 is 50252566.

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 30019441 + 36505764 = 5479^2 + 6042^2 .

It is not a de Polignac number, because 66525205 - 2¹ = 66525203 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 (66525203) 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, 6652516 + ... + 6652525.

It is an arithmetic number, because the mean of its divisors is an integer number (19957563).

Almost surely, 2^66525205 is an apocalyptic number.

It is an amenable number.

66525205 is a deficient number, since it is larger than the sum of its proper divisors (13305047).

66525205 is a wasteful number, since it uses less digits than its factorization.

66525205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13305046.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 66525205 is about 8156.2984864459. The cubic root of 66525205 is about 405.1931304660.

The spelling of 66525205 in words is "sixty-six million, five hundred twenty-five thousand, two hundred five".