81079831582 has 8 divisors (see below), whose sum is σ = 122092976736. Its totient is φ = 40382172672.

The previous prime is 81079831531. The next prime is 81079831643. The reversal of 81079831582 is 28513897018.

It is a happy number.

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, 78870918 + ... + 78871945.

It is an arithmetic number, because the mean of its divisors is an integer number (15261622092).

Almost surely, 2^81079831582 is an apocalyptic number.

81079831582 is a deficient number, since it is larger than the sum of its proper divisors (41013145154).

81079831582 is a wasteful number, since it uses less digits than its factorization.

81079831582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157743122.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 81079831582 in words is "eighty-one billion, seventy-nine million, eight hundred thirty-one thousand, five hundred eighty-two".