80661105 has 72 divisors (see below), whose sum is σ = 164377512. Its totient is φ = 36481536.

The previous prime is 80661089. The next prime is 80661157. The reversal of 80661105 is 50116608.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 80407089 = 504^2 + 8967^2 .

It is not a de Polignac number, because 80661105 - 2⁴ = 80661089 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 346069 + ... + 346301.

It is an arithmetic number, because the mean of its divisors is an integer number (2283021).

Almost surely, 2^80661105 is an apocalyptic number.

It is an amenable number.

80661105 is an abundant number, since it is smaller than the sum of its proper divisors (83716407).

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

80661105 is a wasteful number, since it uses less digits than its factorization.

80661105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 80661105 is about 8981.1527656532. The cubic root of 80661105 is about 432.0706063864.

The spelling of 80661105 in words is "eighty million, six hundred sixty-one thousand, one hundred five".