81778648160026 has 8 divisors (see below), whose sum is σ = 128001362337504. Its totient is φ = 39111527380860.

The previous prime is 81778648160023. The next prime is 81778648160051. The reversal of 81778648160026 is 62006184687718.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81778648160026.

It is not an unprimeable number, because it can be changed into a prime (81778648160021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888898349520 + ... + 888898349611.

It is an arithmetic number, because the mean of its divisors is an integer number (16000170292188).

Almost surely, 2^{81778648160026} is an apocalyptic number.

81778648160026 is a deficient number, since it is larger than the sum of its proper divisors (46222714177478).

81778648160026 is a wasteful number, since it uses less digits than its factorization.

81778648160026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777796699156.

The product of its (nonzero) digits is 43352064, while the sum is 64.

The spelling of 81778648160026 in words is "eighty-one trillion, seven hundred seventy-eight billion, six hundred forty-eight million, one hundred sixty thousand, twenty-six".