66105073 has 4 divisors (see below), whose sum is σ = 66125988. Its totient is φ = 66084160.

The previous prime is 66105049. The next prime is 66105097. The reversal of 66105073 is 37050166.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66105049) and next prime (66105097).

It can be written as a sum of positive squares in 2 ways, for example, as 27751824 + 38353249 = 5268^2 + 6193^2 .

It is a cyclic number.

It is not a de Polignac number, because 66105073 - 2⁹ = 66104561 is a prime.

It is a super-3 number, since 3×66105073³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66105023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4636 + ... + 12397.

It is an arithmetic number, because the mean of its divisors is an integer number (16531497).

Almost surely, 2^66105073 is an apocalyptic number.

It is an amenable number.

66105073 is a deficient number, since it is larger than the sum of its proper divisors (20915).

66105073 is a wasteful number, since it uses less digits than its factorization.

66105073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20914.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 66105073 is about 8130.5026289892. The cubic root of 66105073 is about 404.3383455345.

The spelling of 66105073 in words is "sixty-six million, one hundred five thousand, seventy-three".