81077885705 has 8 divisors (see below), whose sum is σ = 97309035072. Its totient is φ = 64851927088.

The previous prime is 81077885689. The next prime is 81077885711. The reversal of 81077885705 is 50758877018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81077885705 - 2⁴ = 81077885689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263239 + ... + 1325868.

It is an arithmetic number, because the mean of its divisors is an integer number (12163629384).

Almost surely, 2^81077885705 is an apocalyptic number.

It is an amenable number.

81077885705 is a deficient number, since it is larger than the sum of its proper divisors (16231149367).

81077885705 is a wasteful number, since it uses less digits than its factorization.

81077885705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595375.

The product of its (nonzero) digits is 4390400, while the sum is 56.

The spelling of 81077885705 in words is "eighty-one billion, seventy-seven million, eight hundred eighty-five thousand, seven hundred five".