81920886478359 has 8 divisors (see below), whose sum is σ = 109951211874432. Its totient is φ = 54252242700600.

The previous prime is 81920886478273. The next prime is 81920886478463. The reversal of 81920886478359 is 95387468802918.

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

It is a de Polignac number, because none of the positive numbers 2^k-81920886478359 is a prime.

It is a super-2 number, since 2×81920886478359² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81920886478259) 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, 90420404049 + ... + 90420404954.

It is an arithmetic number, because the mean of its divisors is an integer number (13743901484304).

It is a 1-persistent number, because it is pandigital, but 2⋅81920886478359 = 163841772956718 is not.

Almost surely, 2^{81920886478359} is an apocalyptic number.

81920886478359 is a deficient number, since it is larger than the sum of its proper divisors (28030325396073).

81920886478359 is a wasteful number, since it uses less digits than its factorization.

81920886478359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180840809157.

The product of its (nonzero) digits is 1672151040, while the sum is 78.

The spelling of 81920886478359 in words is "eighty-one trillion, nine hundred twenty billion, eight hundred eighty-six million, four hundred seventy-eight thousand, three hundred fifty-nine".