66484081 has 4 divisors (see below), whose sum is σ = 66500464. Its totient is φ = 66467700.

The previous prime is 66484069. The next prime is 66484087. The reversal of 66484081 is 18048466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18048466 = 2 ⋅9024233.

It is a cyclic number.

It is not a de Polignac number, because 66484081 - 2⁵ = 66484049 is a prime.

It is a super-2 number, since 2×66484081² = 8840266052829122, which 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 66484081.

It is not an unprimeable number, because it can be changed into a prime (66484087) 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, 2926 + ... + 11896.

It is an arithmetic number, because the mean of its divisors is an integer number (16625116).

Almost surely, 2^66484081 is an apocalyptic number.

It is an amenable number.

66484081 is a deficient number, since it is larger than the sum of its proper divisors (16383).

66484081 is an equidigital number, since it uses as much as digits as its factorization.

66484081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16382.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 66484081 is about 8153.7771002156. Note that the first 3 decimals coincide. The cubic root of 66484081 is about 405.1096202784.

The spelling of 66484081 in words is "sixty-six million, four hundred eighty-four thousand, eighty-one".