81156106500 has 96 divisors (see below), whose sum is σ = 270087557376. Its totient is φ = 18549964800.

The previous prime is 81156106477. The next prime is 81156106517. The reversal of 81156106500 is 560165118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3854077 + ... + 3875076.

It is an arithmetic number, because the mean of its divisors is an integer number (2813412056).

Almost surely, 2^81156106500 is an apocalyptic number.

It is an amenable number.

81156106500 is an abundant number, since it is smaller than the sum of its proper divisors (188931450876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81156106500 is a wasteful number, since it uses less digits than its factorization.

81156106500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7729182 (or 7729170 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 81156106500 in words is "eighty-one billion, one hundred fifty-six million, one hundred six thousand, five hundred".