100405566 has 12 divisors (see below), whose sum is σ = 217545432. Its totient is φ = 33468516.

The previous prime is 100405549. The next prime is 100405589. The reversal of 100405566 is 665504001.

It is a happy number.

100405566 is a `hidden beast` number, since 100 + 4 + 0 + 556 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2789026 + ... + 2789061.

It is an arithmetic number, because the mean of its divisors is an integer number (18128786).

Almost surely, 2^100405566 is an apocalyptic number.

100405566 is an abundant number, since it is smaller than the sum of its proper divisors (117139866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100405566 is a wasteful number, since it uses less digits than its factorization.

100405566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578095 (or 5578092 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 100405566 is about 10020.2577811152. The cubic root of 100405566 is about 464.7855271774.

Adding to 100405566 its reverse (665504001), we get a palindrome (765909567).

The spelling of 100405566 in words is "one hundred million, four hundred five thousand, five hundred sixty-six".