81417705599 has 2 divisors, whose sum is σ = 81417705600. Its totient is φ = 81417705598.

The previous prime is 81417705547. The next prime is 81417705613. The reversal of 81417705599 is 99550771418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81417705599 - 2¹⁶ = 81417640063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81417705199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40708852799 + 40708852800.

It is an arithmetic number, because the mean of its divisors is an integer number (40708852800).

Almost surely, 2^81417705599 is an apocalyptic number.

81417705599 is a deficient number, since it is larger than the sum of its proper divisors (1).

81417705599 is an equidigital number, since it uses as much as digits as its factorization.

81417705599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 56.

The spelling of 81417705599 in words is "eighty-one billion, four hundred seventeen million, seven hundred five thousand, five hundred ninety-nine".