16666481 has 8 divisors (see below), whose sum is σ = 18243624. Its totient is φ = 15131520.

The previous prime is 16666453. The next prime is 16666487. The reversal of 16666481 is 18466661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3591025 + 13075456 = 1895^2 + 3616^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16666481 - 2⁶ = 16666417 is a prime.

It is a super-2 number, since 2×16666481² = 555543177846722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9716 + ... + 11301.

It is an arithmetic number, because the mean of its divisors is an integer number (2280453).

Almost surely, 2^16666481 is an apocalyptic number.

It is an amenable number.

16666481 is a deficient number, since it is larger than the sum of its proper divisors (1577143).

16666481 is a wasteful number, since it uses less digits than its factorization.

16666481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21091.

The product of its digits is 41472, while the sum is 38.

The square root of 16666481 is about 4082.4601651455. The cubic root of 16666481 is about 255.4355289402.

The spelling of 16666481 in words is "sixteen million, six hundred sixty-six thousand, four hundred eighty-one".