81373370806777 has 48 divisors (see below), whose sum is σ = 96412708477440. Its totient is φ = 68461223846400.

The previous prime is 81373370806757. The next prime is 81373370806829. The reversal of 81373370806777 is 77760807337318.

It is not a de Polignac number, because 81373370806777 - 2¹⁹ = 81373370282489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81373370806747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2805093249 + ... + 2805122257.

It is an arithmetic number, because the mean of its divisors is an integer number (2008598093280).

Almost surely, 2^{81373370806777} is an apocalyptic number.

It is an amenable number.

81373370806777 is a deficient number, since it is larger than the sum of its proper divisors (15039337670663).

81373370806777 is a wasteful number, since it uses less digits than its factorization.

81373370806777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31022 (or 31015 counting only the distinct ones).

The product of its (nonzero) digits is 174254976, while the sum is 67.

The spelling of 81373370806777 in words is "eighty-one trillion, three hundred seventy-three billion, three hundred seventy million, eight hundred six thousand, seven hundred seventy-seven".