81677528898 has 32 divisors (see below), whose sum is σ = 186974853120. Its totient is φ = 23301017040.

The previous prime is 81677528893. The next prime is 81677528921. The reversal of 81677528898 is 89882577618.

It is not an unprimeable number, because it can be changed into a prime (81677528893) 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, 1447818 + ... + 1503173.

It is an arithmetic number, because the mean of its divisors is an integer number (5842964160).

Almost surely, 2^81677528898 is an apocalyptic number.

81677528898 is an abundant number, since it is smaller than the sum of its proper divisors (105297324222).

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

81677528898 is a wasteful number, since it uses less digits than its factorization.

81677528898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951662.

The product of its digits is 108380160, while the sum is 69.

The spelling of 81677528898 in words is "eighty-one billion, six hundred seventy-seven million, five hundred twenty-eight thousand, eight hundred ninety-eight".