66681522 has 16 divisors (see below), whose sum is σ = 148181280. Its totient is φ = 22227156.

The previous prime is 66681521. The next prime is 66681533. The reversal of 66681522 is 22518666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66681521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 617368 + ... + 617475.

It is an arithmetic number, because the mean of its divisors is an integer number (9261330).

Almost surely, 2^66681522 is an apocalyptic number.

66681522 is an abundant number, since it is smaller than the sum of its proper divisors (81499758).

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

66681522 is a wasteful number, since it uses less digits than its factorization.

66681522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234854 (or 1234848 counting only the distinct ones).

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

The square root of 66681522 is about 8165.8754582715. The cubic root of 66681522 is about 405.5102485141.

The spelling of 66681522 in words is "sixty-six million, six hundred eighty-one thousand, five hundred twenty-two".