81741097216 has 81 divisors (see below), whose sum is σ = 165694176739. Its totient is φ = 40246134272.

The previous prime is 81741097211. The next prime is 81741097237. The reversal of 81741097216 is 61279014718.

It is a happy number.

The square root of 81741097216 is 285904.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81741097211) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 489467565 + ... + 489467731.

Almost surely, 2^81741097216 is an apocalyptic number.

81741097216 is the 285904-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81741097216

81741097216 is an abundant number, since it is smaller than the sum of its proper divisors (83953079523).

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

81741097216 is an frugal number, since it uses more digits than its factorization.

81741097216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 81741097216 in words is "eighty-one billion, seven hundred forty-one million, ninety-seven thousand, two hundred sixteen".