80516001557 has 2 divisors, whose sum is σ = 80516001558. Its totient is φ = 80516001556.

The previous prime is 80516001523. The next prime is 80516001623. The reversal of 80516001557 is 75510061508.

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., 79504825156 + 1011176401 = 281966^2 + 31799^2 .

It is a cyclic number.

It is not a de Polignac number, because 80516001557 - 2¹⁶ = 80515936021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80516001557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80516001257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40258000778 + 40258000779.

It is an arithmetic number, because the mean of its divisors is an integer number (40258000779).

Almost surely, 2^80516001557 is an apocalyptic number.

It is an amenable number.

80516001557 is a deficient number, since it is larger than the sum of its proper divisors (1).

80516001557 is an equidigital number, since it uses as much as digits as its factorization.

80516001557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 38.

The spelling of 80516001557 in words is "eighty billion, five hundred sixteen million, one thousand, five hundred fifty-seven".