81018808677 has 48 divisors (see below), whose sum is σ = 123758668800. Its totient is φ = 50971472640.

The previous prime is 81018808643. The next prime is 81018808681. The reversal of 81018808677 is 77680881018.

It is a happy number.

It is not a de Polignac number, because 81018808677 - 2²⁰ = 81017760101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81018808627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8820027 + ... + 8829207.

It is an arithmetic number, because the mean of its divisors is an integer number (2578305600).

Almost surely, 2^81018808677 is an apocalyptic number.

It is an amenable number.

81018808677 is a deficient number, since it is larger than the sum of its proper divisors (42739860123).

81018808677 is a wasteful number, since it uses less digits than its factorization.

81018808677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9778 (or 9775 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 54.

The spelling of 81018808677 in words is "eighty-one billion, eighteen million, eight hundred eight thousand, six hundred seventy-seven".