81738585474 has 64 divisors (see below), whose sum is σ = 201603354624. Its totient is φ = 21514499136.

The previous prime is 81738585473. The next prime is 81738585499. The reversal of 81738585474 is 47458583718.

It is not an unprimeable number, because it can be changed into a prime (81738585473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125827 + ... + 423449.

It is an arithmetic number, because the mean of its divisors is an integer number (3150052416).

Almost surely, 2^81738585474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81738585474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100801677312).

81738585474 is an abundant number, since it is smaller than the sum of its proper divisors (119864769150).

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

81738585474 is a wasteful number, since it uses less digits than its factorization.

81738585474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298151.

The product of its digits is 30105600, while the sum is 60.

The spelling of 81738585474 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred eighty-five thousand, four hundred seventy-four".