78817361117081 has 8 divisors (see below), whose sum is σ = 80342922840840. Its totient is φ = 77293223160192.

The previous prime is 78817361116999. The next prime is 78817361117087. The reversal of 78817361117081 is 18071116371887.

It can be written as a sum of positive squares in 4 ways, for example, as 40057709341456 + 38759651775625 = 6329116^2 + 6225725^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78817361117081 is a prime.

It is a super-2 number, since 2×78817361117081² (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 78817361117081.

It is not an unprimeable number, because it can be changed into a prime (78817361117087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355829930 + ... + 356051363.

It is an arithmetic number, because the mean of its divisors is an integer number (10042865355105).

Almost surely, 2^{78817361117081} is an apocalyptic number.

It is an amenable number.

78817361117081 is a deficient number, since it is larger than the sum of its proper divisors (1525561723759).

78817361117081 is a wasteful number, since it uses less digits than its factorization.

78817361117081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711883435.

The product of its (nonzero) digits is 3161088, while the sum is 59.

The spelling of 78817361117081 in words is "seventy-eight trillion, eight hundred seventeen billion, three hundred sixty-one million, one hundred seventeen thousand, eighty-one".