66565106 has 4 divisors (see below), whose sum is σ = 99847662. Its totient is φ = 33282552.

The previous prime is 66565097. The next prime is 66565111. The reversal of 66565106 is 60156566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60156566 = 2 ⋅30078283.

It can be written as a sum of positive squares in only one way, i.e., 38950081 + 27615025 = 6241^2 + 5255^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16641275 + ... + 16641278.

Almost surely, 2^66565106 is an apocalyptic number.

66565106 is a deficient number, since it is larger than the sum of its proper divisors (33282556).

66565106 is a wasteful number, since it uses less digits than its factorization.

66565106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33282555.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 66565106 is about 8158.7441435554. The cubic root of 66565106 is about 405.2741242277.

The spelling of 66565106 in words is "sixty-six million, five hundred sixty-five thousand, one hundred six".