666104405 has 4 divisors (see below), whose sum is σ = 799325292. Its totient is φ = 532883520.

The previous prime is 666104401. The next prime is 666104407. The reversal of 666104405 is 504401666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504401666 = 2 ⋅252200833.

It can be written as a sum of positive squares in 2 ways, for example, as 254785444 + 411318961 = 15962^2 + 20281^2 .

It is not a de Polignac number, because 666104405 - 2² = 666104401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666104401) 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, 66610436 + ... + 66610445.

It is an arithmetic number, because the mean of its divisors is an integer number (199831323).

Almost surely, 2^666104405 is an apocalyptic number.

It is an amenable number.

666104405 is a deficient number, since it is larger than the sum of its proper divisors (133220887).

666104405 is a wasteful number, since it uses less digits than its factorization.

666104405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133220886.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 666104405 is about 25808.9985276454. The cubic root of 666104405 is about 873.3348052569.

The spelling of 666104405 in words is "six hundred sixty-six million, one hundred four thousand, four hundred five".