81582890558 has 16 divisors (see below), whose sum is σ = 131797934016. Its totient is φ = 37650731040.

The previous prime is 81582890533. The next prime is 81582890581. The reversal of 81582890558 is 85509828518.

It is a super-3 number, since 3×81582890558³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81582890497 and 81582890506.

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, 242060 + ... + 470912.

It is an arithmetic number, because the mean of its divisors is an integer number (8237370876).

Almost surely, 2^81582890558 is an apocalyptic number.

81582890558 is a deficient number, since it is larger than the sum of its proper divisors (50215043458).

81582890558 is a wasteful number, since it uses less digits than its factorization.

81582890558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242579.

The product of its (nonzero) digits is 9216000, while the sum is 59.

The spelling of 81582890558 in words is "eighty-one billion, five hundred eighty-two million, eight hundred ninety thousand, five hundred fifty-eight".