66566963 has 4 divisors (see below), whose sum is σ = 66794448. Its totient is φ = 66339480.

The previous prime is 66566939. The next prime is 66566971. The reversal of 66566963 is 36966566.

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

It is a cyclic number.

It is not a de Polignac number, because 66566963 - 2⁸ = 66566707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66566363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113303 + ... + 113888.

It is an arithmetic number, because the mean of its divisors is an integer number (16698612).

Almost surely, 2^66566963 is an apocalyptic number.

66566963 is a deficient number, since it is larger than the sum of its proper divisors (227485).

66566963 is a wasteful number, since it uses less digits than its factorization.

66566963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227484.

The product of its digits is 1049760, while the sum is 47.

The square root of 66566963 is about 8158.8579470414. The cubic root of 66566963 is about 405.2778929042.

The spelling of 66566963 in words is "sixty-six million, five hundred sixty-six thousand, nine hundred sixty-three".