66920105 has 16 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 45811392.

The previous prime is 66920099. The next prime is 66920107. The reversal of 66920105 is 50102966.

It is a cyclic number.

It is not a de Polignac number, because 66920105 - 2⁴ = 66920089 is a prime.

It is a super-2 number, since 2×66920105² = 8956600906422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66920107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26696 + ... + 29094.

It is an arithmetic number, because the mean of its divisors is an integer number (5745600).

Almost surely, 2^66920105 is an apocalyptic number.

It is an amenable number.

66920105 is a deficient number, since it is larger than the sum of its proper divisors (25009495).

66920105 is a wasteful number, since it uses less digits than its factorization.

66920105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 66920105 is about 8180.4709522130. The cubic root of 66920105 is about 405.9933043457.

The spelling of 66920105 in words is "sixty-six million, nine hundred twenty thousand, one hundred five".