81677558676 has 96 divisors (see below), whose sum is σ = 221103203328. Its totient is φ = 22984980480.

The previous prime is 81677558653. The next prime is 81677558681. The reversal of 81677558676 is 67685577618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2290036 + ... + 2325428.

It is an arithmetic number, because the mean of its divisors is an integer number (2303158368).

Almost surely, 2^81677558676 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81677558676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110551601664).

81677558676 is an abundant number, since it is smaller than the sum of its proper divisors (139425644652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81677558676 is a wasteful number, since it uses less digits than its factorization.

81677558676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35821 (or 35819 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 66.

The spelling of 81677558676 in words is "eighty-one billion, six hundred seventy-seven million, five hundred fifty-eight thousand, six hundred seventy-six".