81769607873 has 2 divisors, whose sum is σ = 81769607874. Its totient is φ = 81769607872.

The previous prime is 81769607869. The next prime is 81769608043. The reversal of 81769607873 is 37870696718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56800235584 + 24969372289 = 238328^2 + 158017^2 .

It is a cyclic number.

It is not a de Polignac number, because 81769607873 - 2² = 81769607869 is a prime.

It is not a weakly prime, because it can be changed into another prime (81769607813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40884803936 + 40884803937.

It is an arithmetic number, because the mean of its divisors is an integer number (40884803937).

Almost surely, 2^81769607873 is an apocalyptic number.

It is an amenable number.

81769607873 is a deficient number, since it is larger than the sum of its proper divisors (1).

81769607873 is an equidigital number, since it uses as much as digits as its factorization.

81769607873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21337344, while the sum is 62.

The spelling of 81769607873 in words is "eighty-one billion, seven hundred sixty-nine million, six hundred seven thousand, eight hundred seventy-three".