66363661 has 8 divisors (see below), whose sum is σ = 81678464. Its totient is φ = 52507440.

The previous prime is 66363623. The next prime is 66363679. The reversal of 66363661 is 16636366.

66363661 is nontrivially palindromic in base 9.

66363661 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 a de Polignac number, because none of the positive numbers 2^k-66363661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66363661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66363601) 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, 364545 + ... + 364726.

It is an arithmetic number, because the mean of its divisors is an integer number (10209808).

Almost surely, 2^66363661 is an apocalyptic number.

It is an amenable number.

66363661 is a deficient number, since it is larger than the sum of its proper divisors (15314803).

66363661 is a wasteful number, since it uses less digits than its factorization.

66363661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729291.

The product of its digits is 69984, while the sum is 37.

The square root of 66363661 is about 8146.3894456379. The cubic root of 66363661 is about 404.8648860879.

The spelling of 66363661 in words is "sixty-six million, three hundred sixty-three thousand, six hundred sixty-one".