66522618 has 24 divisors (see below), whose sum is σ = 146577600. Its totient is φ = 21798024.

The previous prime is 66522611. The next prime is 66522619. The reversal of 66522618 is 81622566.

It is not an unprimeable number, because it can be changed into a prime (66522611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30258 + ... + 32381.

It is an arithmetic number, because the mean of its divisors is an integer number (6107400).

Almost surely, 2^66522618 is an apocalyptic number.

66522618 is an abundant number, since it is smaller than the sum of its proper divisors (80054982).

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

66522618 is a wasteful number, since it uses less digits than its factorization.

66522618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62706 (or 62703 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 66522618 is about 8156.1398958086. The cubic root of 66522618 is about 405.1878780797.

The spelling of 66522618 in words is "sixty-six million, five hundred twenty-two thousand, six hundred eighteen".