66653701 has 8 divisors (see below), whose sum is σ = 70865280. Its totient is φ = 62551632.

The previous prime is 66653683. The next prime is 66653711. The reversal of 66653701 is 10735666.

It is a happy number.

66653701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66653701 - 2¹¹ = 66651653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66653711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26121 + ... + 28558.

It is an arithmetic number, because the mean of its divisors is an integer number (8858160).

Almost surely, 2^66653701 is an apocalyptic number.

It is an amenable number.

66653701 is a deficient number, since it is larger than the sum of its proper divisors (4211579).

66653701 is a wasteful number, since it uses less digits than its factorization.

66653701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54755.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66653701 is about 8164.1717889814. The cubic root of 66653701 is about 405.4538447327.

The spelling of 66653701 in words is "sixty-six million, six hundred fifty-three thousand, seven hundred one".