65666724 has 12 divisors (see below), whose sum is σ = 153222384. Its totient is φ = 21888904.

The previous prime is 65666681. The next prime is 65666737. The reversal of 65666724 is 42766656.

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

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, 2736102 + ... + 2736125.

It is an arithmetic number, because the mean of its divisors is an integer number (12768532).

Almost surely, 2^65666724 is an apocalyptic number.

It is an amenable number.

65666724 is an abundant number, since it is smaller than the sum of its proper divisors (87555660).

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

65666724 is a wasteful number, since it uses less digits than its factorization.

65666724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472234 (or 5472232 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 65666724 is about 8103.5007249953. The cubic root of 65666724 is about 403.4426274552.

The spelling of 65666724 in words is "sixty-five million, six hundred sixty-six thousand, seven hundred twenty-four".