81037483777 has 2 divisors, whose sum is σ = 81037483778. Its totient is φ = 81037483776.

The previous prime is 81037483729. The next prime is 81037483819. The reversal of 81037483777 is 77738473018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51177298176 + 29860185601 = 226224^2 + 172801^2 .

It is a cyclic number.

It is not a de Polignac number, because 81037483777 - 2²⁷ = 80903266049 is a prime.

It is not a weakly prime, because it can be changed into another prime (81037493777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518741888 + 40518741889.

It is an arithmetic number, because the mean of its divisors is an integer number (40518741889).

Almost surely, 2^81037483777 is an apocalyptic number.

It is an amenable number.

81037483777 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037483777 is an equidigital number, since it uses as much as digits as its factorization.

81037483777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 81037483777 in words is "eighty-one billion, thirty-seven million, four hundred eighty-three thousand, seven hundred seventy-seven".