81114782558 has 16 divisors (see below), whose sum is σ = 128089001040. Its totient is φ = 38418883200.

The previous prime is 81114782531. The next prime is 81114782569. The reversal of 81114782558 is 85528741118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288788 + ... + 495608.

It is an arithmetic number, because the mean of its divisors is an integer number (8005562565).

Almost surely, 2^81114782558 is an apocalyptic number.

81114782558 is a deficient number, since it is larger than the sum of its proper divisors (46974218482).

81114782558 is a wasteful number, since it uses less digits than its factorization.

81114782558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217163.

The product of its digits is 716800, while the sum is 50.

The spelling of 81114782558 in words is "eighty-one billion, one hundred fourteen million, seven hundred eighty-two thousand, five hundred fifty-eight".