66520984 has 16 divisors (see below), whose sum is σ = 124843320. Its totient is φ = 33229440.

The previous prime is 66520969. The next prime is 66521011. The reversal of 66520984 is 48902566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7024 + ... + 13504.

Almost surely, 2^66520984 is an apocalyptic number.

It is an amenable number.

66520984 is a deficient number, since it is larger than the sum of its proper divisors (58322336).

66520984 is a wasteful number, since it uses less digits than its factorization.

66520984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770 (or 7766 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 66520984 is about 8156.0397252588. The cubic root of 66520984 is about 405.1845604993.

The spelling of 66520984 in words is "sixty-six million, five hundred twenty thousand, nine hundred eighty-four".