66020684 has 6 divisors (see below), whose sum is σ = 115536204. Its totient is φ = 33010340.

The previous prime is 66020671. The next prime is 66020693. The reversal of 66020684 is 48602066.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66020684.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252582 + ... + 8252589.

It is an arithmetic number, because the mean of its divisors is an integer number (19256034).

Almost surely, 2^66020684 is an apocalyptic number.

It is an amenable number.

66020684 is a deficient number, since it is larger than the sum of its proper divisors (49515520).

66020684 is a wasteful number, since it uses less digits than its factorization.

66020684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16505175 (or 16505173 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 66020684 is about 8125.3113171127. The cubic root of 66020684 is about 404.1662143238.

The spelling of 66020684 in words is "sixty-six million, twenty thousand, six hundred eighty-four".