81079200577 has 2 divisors, whose sum is σ = 81079200578. Its totient is φ = 81079200576.

The previous prime is 81079200571. The next prime is 81079200583. The reversal of 81079200577 is 77500297018.

It is a balanced prime because it is at equal distance from previous prime (81079200571) and next prime (81079200583).

It can be written as a sum of positive squares in only one way, i.e., 55161098496 + 25918102081 = 234864^2 + 160991^2 .

It is a cyclic number.

It is not a de Polignac number, because 81079200577 - 2³ = 81079200569 is a prime.

It is not a weakly prime, because it can be changed into another prime (81079200571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539600288 + 40539600289.

It is an arithmetic number, because the mean of its divisors is an integer number (40539600289).

Almost surely, 2^81079200577 is an apocalyptic number.

It is an amenable number.

81079200577 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079200577 is an equidigital number, since it uses as much as digits as its factorization.

81079200577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 46.

The spelling of 81079200577 in words is "eighty-one billion, seventy-nine million, two hundred thousand, five hundred seventy-seven".