66563841 has 8 divisors (see below), whose sum is σ = 88810560. Its totient is φ = 44346512.

The previous prime is 66563807. The next prime is 66563867. The reversal of 66563841 is 14836566.

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 66563841 - 2⁷ = 66563713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66563841.

It is not an unprimeable number, because it can be changed into a prime (66563881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1365 + ... + 11618.

It is an arithmetic number, because the mean of its divisors is an integer number (11101320).

Almost surely, 2^66563841 is an apocalyptic number.

It is an amenable number.

66563841 is a deficient number, since it is larger than the sum of its proper divisors (22246719).

66563841 is a wasteful number, since it uses less digits than its factorization.

66563841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14695.

The product of its digits is 103680, while the sum is 39.

The square root of 66563841 is about 8158.6666190009. Note that the first 4 decimals coincide. The cubic root of 66563841 is about 405.2715569416.

The spelling of 66563841 in words is "sixty-six million, five hundred sixty-three thousand, eight hundred forty-one".