80455561 has 2 divisors, whose sum is σ = 80455562. Its totient is φ = 80455560.

The previous prime is 80455559. The next prime is 80455591. The reversal of 80455561 is 16555408.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57836025 + 22619536 = 7605^2 + 4756^2 .

It is a cyclic number.

It is not a de Polignac number, because 80455561 - 2¹ = 80455559 is a prime.

Together with 80455559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80455511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40227780 + 40227781.

It is an arithmetic number, because the mean of its divisors is an integer number (40227781).

Almost surely, 2^80455561 is an apocalyptic number.

It is an amenable number.

80455561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80455561 is an equidigital number, since it uses as much as digits as its factorization.

80455561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 80455561 is about 8969.7023919414. The cubic root of 80455561 is about 431.7032874093.

It can be divided in two parts, 804 and 55561, that added together give a palindrome (56365).

The spelling of 80455561 in words is "eighty million, four hundred fifty-five thousand, five hundred sixty-one".