80445561 has 16 divisors (see below), whose sum is σ = 125435904. Its totient is φ = 44899344.

The previous prime is 80445517. The next prime is 80445593. The reversal of 80445561 is 16554408.

It is not a de Polignac number, because 80445561 - 2⁹ = 80445049 is a prime.

It is a super-3 number, since 3×80445561³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80445461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43641 + ... + 45446.

It is an arithmetic number, because the mean of its divisors is an integer number (7839744).

Almost surely, 2^80445561 is an apocalyptic number.

It is an amenable number.

80445561 is a deficient number, since it is larger than the sum of its proper divisors (44990343).

80445561 is a wasteful number, since it uses less digits than its factorization.

80445561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89140.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 80445561 is about 8969.1449425238. The cubic root of 80445561 is about 431.6854008821.

Adding to 80445561 its reverse (16554408), we get a palindrome (96999969).

The spelling of 80445561 in words is "eighty million, four hundred forty-five thousand, five hundred sixty-one".