666104481 has 27 divisors (see below), whose sum is σ = 1120148211. Its totient is φ = 380321424.

The previous prime is 666104473. The next prime is 666104497. The reversal of 666104481 is 184401666.

The square root of 666104481 is 25809.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 657460881 + 8643600 = 25641^2 + 2940^2 .

It is not a de Polignac number, because 666104481 - 2³ = 666104473 is a prime.

It is a super-2 number, since 2×666104481² = 887390359216558722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666104401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 541375 + ... + 542603.

Almost surely, 2^666104481 is an apocalyptic number.

666104481 is the 25809-th square number.

666104481 is the 12905-th centered octagonal number.

It is an amenable number.

666104481 is a deficient number, since it is larger than the sum of its proper divisors (454043730).

666104481 is an equidigital number, since it uses as much as digits as its factorization.

666104481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The cubic root of 666104481 is about 873.3348384716.

Multiplying 666104481 by its sum of digits (36), we get a square (23979761316 = 154854²).

The spelling of 666104481 in words is "six hundred sixty-six million, one hundred four thousand, four hundred eighty-one".