66522250 has 16 divisors (see below), whose sum is σ = 124530120. Its totient is φ = 26608800.

The previous prime is 66522229. The next prime is 66522257. The reversal of 66522250 is 5222566.

It can be written as a sum of positive squares in 4 ways, for example, as 25010001 + 41512249 = 5001^2 + 6443^2 .

It is not an unprimeable number, because it can be changed into a prime (66522257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132795 + ... + 133294.

Almost surely, 2^66522250 is an apocalyptic number.

66522250 is a deficient number, since it is larger than the sum of its proper divisors (58007870).

66522250 is a wasteful number, since it uses less digits than its factorization.

66522250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266106 (or 266096 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66522250 is about 8156.1173360858. The cubic root of 66522250 is about 405.1871309183.

It can be divided in two parts, 6 and 6522250, that added together give a palindrome (6522256).

The spelling of 66522250 in words is "sixty-six million, five hundred twenty-two thousand, two hundred fifty".