6666481 has 4 divisors (see below), whose sum is σ = 6956352. Its totient is φ = 6376612.

The previous prime is 6666479. The next prime is 6666487. The reversal of 6666481 is 1846666.

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 an emirpimes, since its reverse is a distinct semiprime: 1846666 = 2 ⋅923333.

It is not a de Polignac number, because 6666481 - 2¹ = 6666479 is a prime.

It is a super-2 number, since 2×6666481² = 88883937846722, which contains 22 as substring.

It is a Duffinian number.

6666481 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666481.

It is not an unprimeable number, because it can be changed into a prime (6666487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144901 + ... + 144946.

It is an arithmetic number, because the mean of its divisors is an integer number (1739088).

Almost surely, 2^6666481 is an apocalyptic number.

It is an amenable number.

6666481 is a deficient number, since it is larger than the sum of its proper divisors (289871).

6666481 is a wasteful number, since it uses less digits than its factorization.

6666481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289870.

The product of its digits is 41472, while the sum is 37.

The square root of 6666481 is about 2581.9529430259. The cubic root of 6666481 is about 188.2054585698.

The spelling of 6666481 in words is "six million, six hundred sixty-six thousand, four hundred eighty-one".