81755731677 has 16 divisors (see below), whose sum is σ = 112791349760. Its totient is φ = 52620321600.

The previous prime is 81755731663. The next prime is 81755731721. The reversal of 81755731677 is 77613755718.

It is not a de Polignac number, because 81755731677 - 2⁴ = 81755731661 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 (81755731627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004902 + ... + 1083207.

It is an arithmetic number, because the mean of its divisors is an integer number (7049459360).

Almost surely, 2^81755731677 is an apocalyptic number.

It is an amenable number.

81755731677 is a deficient number, since it is larger than the sum of its proper divisors (31035618083).

81755731677 is a wasteful number, since it uses less digits than its factorization.

81755731677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088564.

The product of its digits is 8643600, while the sum is 57.

The spelling of 81755731677 in words is "eighty-one billion, seven hundred fifty-five million, seven hundred thirty-one thousand, six hundred seventy-seven".