66566113 has 4 divisors (see below), whose sum is σ = 66656448. Its totient is φ = 66475780.

The previous prime is 66566099. The next prime is 66566131. The reversal of 66566113 is 31166566.

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: 31166566 = 2 ⋅15583283.

It is a cyclic number.

It is not a de Polignac number, because 66566113 - 2¹⁷ = 66435041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66566413) 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, 44053 + ... + 45538.

It is an arithmetic number, because the mean of its divisors is an integer number (16664112).

Almost surely, 2^66566113 is an apocalyptic number.

It is an amenable number.

66566113 is a deficient number, since it is larger than the sum of its proper divisors (90335).

66566113 is an equidigital number, since it uses as much as digits as its factorization.

66566113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90334.

The product of its digits is 19440, while the sum is 34.

The square root of 66566113 is about 8158.8058562513. The cubic root of 66566113 is about 405.2761678859.

It can be divided in two parts, 6656 and 6113, that added together give a square (12769 = 113²).

The spelling of 66566113 in words is "sixty-six million, five hundred sixty-six thousand, one hundred thirteen".