80955565 has 4 divisors (see below), whose sum is σ = 97146684. Its totient is φ = 64764448.

The previous prime is 80955529. The next prime is 80955569. The reversal of 80955565 is 56555908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10361961 + 70593604 = 3219^2 + 8402^2 .

It is a cyclic number.

It is not a de Polignac number, because 80955565 - 2⁷ = 80955437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80955569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8095552 + ... + 8095561.

It is an arithmetic number, because the mean of its divisors is an integer number (24286671).

Almost surely, 2^80955565 is an apocalyptic number.

It is an amenable number.

80955565 is a deficient number, since it is larger than the sum of its proper divisors (16191119).

80955565 is a wasteful number, since it uses less digits than its factorization.

80955565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16191118.

The product of its (nonzero) digits is 270000, while the sum is 43.

The square root of 80955565 is about 8997.5310502382. The cubic root of 80955565 is about 432.5957376576.

The spelling of 80955565 in words is "eighty million, nine hundred fifty-five thousand, five hundred sixty-five".