81422568878 has 32 divisors (see below), whose sum is σ = 146949277440. Its totient is φ = 33053987520.

The previous prime is 81422568869. The next prime is 81422568917. The reversal of 81422568878 is 87886522418.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2248625 + ... + 2284547.

It is an arithmetic number, because the mean of its divisors is an integer number (4592164920).

Almost surely, 2^81422568878 is an apocalyptic number.

81422568878 is a deficient number, since it is larger than the sum of its proper divisors (65526708562).

81422568878 is a wasteful number, since it uses less digits than its factorization.

81422568878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44472.

The product of its digits is 13762560, while the sum is 59.

The spelling of 81422568878 in words is "eighty-one billion, four hundred twenty-two million, five hundred sixty-eight thousand, eight hundred seventy-eight".