66031963 has 4 divisors (see below), whose sum is σ = 66142800. Its totient is φ = 65921128.

The previous prime is 66031949. The next prime is 66031969. The reversal of 66031963 is 36913066.

It is a happy number.

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-66031963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66031969) 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, 54520 + ... + 55717.

It is an arithmetic number, because the mean of its divisors is an integer number (16535700).

Almost surely, 2^66031963 is an apocalyptic number.

66031963 is a deficient number, since it is larger than the sum of its proper divisors (110837).

66031963 is a wasteful number, since it uses less digits than its factorization.

66031963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110836.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 66031963 is about 8126.0053531855. The cubic root of 66031963 is about 404.1892289857.

It can be divided in two parts, 660 and 31963, that added together give a palindrome (32623).

The spelling of 66031963 in words is "sixty-six million, thirty-one thousand, nine hundred sixty-three".