80557681 has 2 divisors, whose sum is σ = 80557682. Its totient is φ = 80557680.

The previous prime is 80557657. The next prime is 80557691. The reversal of 80557681 is 18675508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80550625 + 7056 = 8975^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 80557681 - 2⁷ = 80557553 is a prime.

It is a super-2 number, since 2×80557681² = 12979079936195522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80557691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40278840 + 40278841.

It is an arithmetic number, because the mean of its divisors is an integer number (40278841).

Almost surely, 2^80557681 is an apocalyptic number.

It is an amenable number.

80557681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80557681 is an equidigital number, since it uses as much as digits as its factorization.

80557681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 80557681 is about 8975.3930833140. The cubic root of 80557681 is about 431.8858598344.

The spelling of 80557681 in words is "eighty million, five hundred fifty-seven thousand, six hundred eighty-one".