66500072 has 16 divisors (see below), whose sum is σ = 125854560. Its totient is φ = 32938864.

The previous prime is 66500069. The next prime is 66500081. The reversal of 66500072 is 27000566.

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 3 ways as a sum of consecutive naturals, for example, 37988 + ... + 39699.

It is an arithmetic number, because the mean of its divisors is an integer number (7865910).

Almost surely, 2^66500072 is an apocalyptic number.

It is an amenable number.

66500072 is a deficient number, since it is larger than the sum of its proper divisors (59354488).

66500072 is a wasteful number, since it uses less digits than its factorization.

66500072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77800 (or 77796 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 66500072 is about 8154.7576297521. The cubic root of 66500072 is about 405.1420971688.

The spelling of 66500072 in words is "sixty-six million, five hundred thousand, seventy-two".