66660105 has 16 divisors (see below), whose sum is σ = 109137600. Its totient is φ = 34724928.

The previous prime is 66660103. The next prime is 66660107. The reversal of 66660105 is 50106666.

It is an interprime number because it is at equal distance from previous prime (66660103) and next prime (66660107).

It is not a de Polignac number, because 66660105 - 2¹ = 66660103 is a prime.

It is a super-2 number, since 2×66660105² = 8887139197222050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66660103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51030 + ... + 52319.

It is an arithmetic number, because the mean of its divisors is an integer number (6821100).

Almost surely, 2^66660105 is an apocalyptic number.

It is an amenable number.

66660105 is a deficient number, since it is larger than the sum of its proper divisors (42477495).

66660105 is a wasteful number, since it uses less digits than its factorization.

66660105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103400.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 66660105 is about 8164.5639810096. The cubic root of 66660105 is about 405.4668294744.

The spelling of 66660105 in words is "sixty-six million, six hundred sixty thousand, one hundred five".