80185561 has 4 divisors (see below), whose sum is σ = 82772224. Its totient is φ = 77598900.

The previous prime is 80185519. The next prime is 80185577. The reversal of 80185561 is 16558108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80185561 - 2¹¹ = 80183513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80125561) 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, 1293285 + ... + 1293346.

It is an arithmetic number, because the mean of its divisors is an integer number (20693056).

Almost surely, 2^80185561 is an apocalyptic number.

It is an amenable number.

80185561 is a deficient number, since it is larger than the sum of its proper divisors (2586663).

80185561 is a wasteful number, since it uses less digits than its factorization.

80185561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586662.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 80185561 is about 8954.6390770371. The cubic root of 80185561 is about 431.2198299695.

The spelling of 80185561 in words is "eighty million, one hundred eighty-five thousand, five hundred sixty-one".