81156156118 has 16 divisors (see below), whose sum is σ = 127657068480. Its totient is φ = 38642135616.

The previous prime is 81156156083. The next prime is 81156156157. The reversal of 81156156118 is 81165165118.

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, 9579630 + ... + 9588097.

It is an arithmetic number, because the mean of its divisors is an integer number (7978566780).

Almost surely, 2^81156156118 is an apocalyptic number.

81156156118 is a deficient number, since it is larger than the sum of its proper divisors (46500912362).

81156156118 is a wasteful number, since it uses less digits than its factorization.

81156156118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19167831.

The product of its digits is 57600, while the sum is 43.

The spelling of 81156156118 in words is "eighty-one billion, one hundred fifty-six million, one hundred fifty-six thousand, one hundred eighteen".