81536702582 has 8 divisors (see below), whose sum is σ = 122317144752. Its totient is φ = 40764321000.

The previous prime is 81536702551. The next prime is 81536702617. The reversal of 81536702582 is 28520763518.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989794 + ... + 2030357.

It is an arithmetic number, because the mean of its divisors is an integer number (15289643094).

Almost surely, 2^81536702582 is an apocalyptic number.

81536702582 is a deficient number, since it is larger than the sum of its proper divisors (40780442170).

81536702582 is a wasteful number, since it uses less digits than its factorization.

81536702582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030294.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 81536702582 in words is "eighty-one billion, five hundred thirty-six million, seven hundred two thousand, five hundred eighty-two".