81436113446416 has 15 divisors (see below), whose sum is σ = 157782539739981. Its totient is φ = 40718038674816.

The previous prime is 81436113446321. The next prime is 81436113446417. The reversal of 81436113446416 is 61464431163418.

The square root of 81436113446416 is 9024196.

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

It can be written as a sum of positive squares in only one way, i.e., 38576570688016 + 42859542758400 = 6211004^2 + 6546720^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81436113446417) 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 2 ways as a sum of consecutive naturals, for example, 34968760 + ... + 37224808.

Almost surely, 2^{81436113446416} is an apocalyptic number.

81436113446416 is the 9024196-th square number.

It is an amenable number.

81436113446416 is a deficient number, since it is larger than the sum of its proper divisors (76346426293565).

81436113446416 is an frugal number, since it uses more digits than its factorization.

81436113446416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512106 (or 2256051 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The spelling of 81436113446416 in words is "eighty-one trillion, four hundred thirty-six billion, one hundred thirteen million, four hundred forty-six thousand, four hundred sixteen".