81697034600 has 96 divisors (see below), whose sum is σ = 195746846400. Its totient is φ = 31690329600.

The previous prime is 81697034593. The next prime is 81697034663. The reversal of 81697034600 is 643079618.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1339571 + ... + 1399229.

It is an arithmetic number, because the mean of its divisors is an integer number (2039029650).

Almost surely, 2^81697034600 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 81697034600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97873423200).

81697034600 is an abundant number, since it is smaller than the sum of its proper divisors (114049811800).

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

81697034600 is a wasteful number, since it uses less digits than its factorization.

81697034600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59883 (or 59874 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 81697034600 in words is "eighty-one billion, six hundred ninety-seven million, thirty-four thousand, six hundred".