81698146704 has 120 divisors (see below), whose sum is σ = 229713868800. Its totient is φ = 27105302016.

The previous prime is 81698146681. The next prime is 81698146787. The reversal of 81698146704 is 40764189618.

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, 33034812 + ... + 33037284.

It is an arithmetic number, because the mean of its divisors is an integer number (1914282240).

Almost surely, 2^81698146704 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 81698146704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114856934400).

81698146704 is an abundant number, since it is smaller than the sum of its proper divisors (148015722096).

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

81698146704 is a wasteful number, since it uses less digits than its factorization.

81698146704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469 (or 3460 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 81698146704 in words is "eighty-one billion, six hundred ninety-eight million, one hundred forty-six thousand, seven hundred four".