66637242 has 40 divisors (see below), whose sum is σ = 170650656. Its totient is φ = 19038888.

The previous prime is 66637231. The next prime is 66637267. The reversal of 66637242 is 24273666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66637197 and 66637206.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 28248 + ... + 30515.

Almost surely, 2^66637242 is an apocalyptic number.

66637242 is an abundant number, since it is smaller than the sum of its proper divisors (104013414).

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

66637242 is a wasteful number, since it uses less digits than its factorization.

66637242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58784 (or 58775 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 66637242 is about 8163.1637249292. The cubic root of 66637242 is about 405.4204686706.

The spelling of 66637242 in words is "sixty-six million, six hundred thirty-seven thousand, two hundred forty-two".