81616051202713 has 8 divisors (see below), whose sum is σ = 84672318717000. Its totient is φ = 78575911749888.

The previous prime is 81616051202687. The next prime is 81616051202729. The reversal of 81616051202713 is 31720215061618.

It can be written as a sum of positive squares in 4 ways, for example, as 30445377459289 + 51170673743424 = 5517733^2 + 7153368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81616051202713 - 2⁴¹ = 79417027947161 is a prime.

It is a super-2 number, since 2×81616051202713² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81616051202713.

It is not an unprimeable number, because it can be changed into a prime (81616051202113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4032005056 + ... + 4032025297.

It is an arithmetic number, because the mean of its divisors is an integer number (10584039839625).

Almost surely, 2^{81616051202713} is an apocalyptic number.

It is an amenable number.

81616051202713 is a deficient number, since it is larger than the sum of its proper divisors (3056267514287).

81616051202713 is a wasteful number, since it uses less digits than its factorization.

81616051202713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8064030731.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 81616051202713 in words is "eighty-one trillion, six hundred sixteen billion, fifty-one million, two hundred two thousand, seven hundred thirteen".