66563633 has 4 divisors (see below), whose sum is σ = 69457728. Its totient is φ = 63669540.

The previous prime is 66563617. The next prime is 66563639. The reversal of 66563633 is 33636566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33636566 = 2 ⋅16818283.

It is a cyclic number.

It is not a de Polignac number, because 66563633 - 2⁴ = 66563617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66563639) by changing a digit.

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, 1447013 + ... + 1447058.

It is an arithmetic number, because the mean of its divisors is an integer number (17364432).

Almost surely, 2^66563633 is an apocalyptic number.

It is an amenable number.

66563633 is a deficient number, since it is larger than the sum of its proper divisors (2894095).

66563633 is a wasteful number, since it uses less digits than its factorization.

66563633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894094.

The product of its digits is 174960, while the sum is 38.

The square root of 66563633 is about 8158.6538718100. The cubic root of 66563633 is about 405.2711348076.

The spelling of 66563633 in words is "sixty-six million, five hundred sixty-three thousand, six hundred thirty-three".