81698180274 has 48 divisors (see below), whose sum is σ = 178925220864. Its totient is φ = 26938980000.

The previous prime is 81698180273. The next prime is 81698180309. The reversal of 81698180274 is 47208189618.

It is a self number, because there is not a number n which added to its sum of digits gives 81698180274.

It is not an unprimeable number, because it can be changed into a prime (81698180273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2072997 + ... + 2112039.

It is an arithmetic number, because the mean of its divisors is an integer number (3727608768).

Almost surely, 2^81698180274 is an apocalyptic number.

81698180274 is an abundant number, since it is smaller than the sum of its proper divisors (97227040590).

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

81698180274 is a wasteful number, since it uses less digits than its factorization.

81698180274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40303 (or 40300 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 81698180274 in words is "eighty-one billion, six hundred ninety-eight million, one hundred eighty thousand, two hundred seventy-four".