66103663 has 4 divisors (see below), whose sum is σ = 66148048. Its totient is φ = 66059280.

The previous prime is 66103643. The next prime is 66103669. The reversal of 66103663 is 36630166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66103663 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 (66103669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19878 + ... + 22963.

It is an arithmetic number, because the mean of its divisors is an integer number (16537012).

Almost surely, 2^66103663 is an apocalyptic number.

66103663 is a deficient number, since it is larger than the sum of its proper divisors (44385).

66103663 is a wasteful number, since it uses less digits than its factorization.

66103663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44384.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66103663 is about 8130.4159180204. The cubic root of 66103663 is about 404.3354707117.

It can be divided in two parts, 66103 and 663, that added together give a palindrome (66766).

The spelling of 66103663 in words is "sixty-six million, one hundred three thousand, six hundred sixty-three".