66537708 has 12 divisors (see below), whose sum is σ = 155254680. Its totient is φ = 22179232.

The previous prime is 66537707. The next prime is 66537719. The reversal of 66537708 is 80773566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66537708.

It is not an unprimeable number, because it can be changed into a prime (66537707) 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, 2772393 + ... + 2772416.

It is an arithmetic number, because the mean of its divisors is an integer number (12937890).

Almost surely, 2^66537708 is an apocalyptic number.

It is an amenable number.

66537708 is an abundant number, since it is smaller than the sum of its proper divisors (88716972).

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

66537708 is a wasteful number, since it uses less digits than its factorization.

66537708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544816 (or 5544814 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 66537708 is about 8157.0649133129. The cubic root of 66537708 is about 405.2185133885.

The spelling of 66537708 in words is "sixty-six million, five hundred thirty-seven thousand, seven hundred eight".