81292842086399 has 4 divisors (see below), whose sum is σ = 81293711817360. Its totient is φ = 81291972355440.

The previous prime is 81292842086377. The next prime is 81292842086419. The reversal of 81292842086399 is 99368024829218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81292842086399 - 2²⁸ = 81292573650943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81292842082399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434725262 + ... + 434912219.

It is an arithmetic number, because the mean of its divisors is an integer number (20323427954340).

Almost surely, 2^{81292842086399} is an apocalyptic number.

81292842086399 is a deficient number, since it is larger than the sum of its proper divisors (869730961).

81292842086399 is an equidigital number, since it uses as much as digits as its factorization.

81292842086399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869730960.

The product of its (nonzero) digits is 214990848, while the sum is 71.

The spelling of 81292842086399 in words is "eighty-one trillion, two hundred ninety-two billion, eight hundred forty-two million, eighty-six thousand, three hundred ninety-nine".