66006420481 has 4 divisors (see below), whose sum is σ = 66060658692. Its totient is φ = 65952182272.

The previous prime is 66006420463. The next prime is 66006420503. The reversal of 66006420481 is 18402460066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18402460066 = 2 ⋅9201230033.

It can be written as a sum of positive squares in 2 ways, for example, as 35916314256 + 30090106225 = 189516^2 + 173465^2 .

It is a cyclic number.

It is not a de Polignac number, because 66006420481 - 2⁵ = 66006420449 is a prime.

It is a super-2 number, since 2×66006420481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66006420481.

It is not an unprimeable number, because it can be changed into a prime (66006420461) 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, 27117280 + ... + 27119713.

It is an arithmetic number, because the mean of its divisors is an integer number (16515164673).

Almost surely, 2^66006420481 is an apocalyptic number.

It is an amenable number.

66006420481 is a deficient number, since it is larger than the sum of its proper divisors (54238211).

66006420481 is a wasteful number, since it uses less digits than its factorization.

66006420481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54238210.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 66006420481 in words is "sixty-six billion, six million, four hundred twenty thousand, four hundred eighty-one".