66775105 has 8 divisors (see below), whose sum is σ = 80546472. Its totient is φ = 53142528.

The previous prime is 66775103. The next prime is 66775123. The reversal of 66775105 is 50157766.

It can be written as a sum of positive squares in 4 ways, for example, as 10284849 + 56490256 = 3207^2 + 7516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66775105 - 2¹ = 66775103 is a prime.

It is a super-2 number, since 2×66775105² = 8917829295522050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66775103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33634 + ... + 35563.

It is an arithmetic number, because the mean of its divisors is an integer number (10068309).

Almost surely, 2^66775105 is an apocalyptic number.

It is an amenable number.

66775105 is a deficient number, since it is larger than the sum of its proper divisors (13771367).

66775105 is a wasteful number, since it uses less digits than its factorization.

66775105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69395.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 66775105 is about 8171.6035757983. The cubic root of 66775105 is about 405.6998618952.

The spelling of 66775105 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred five".