81108187546 has 8 divisors (see below), whose sum is σ = 124250840640. Its totient is φ = 39691240668.

The previous prime is 81108187513. The next prime is 81108187547. The reversal of 81108187546 is 64578180118.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81108187546.

It is not an unprimeable number, because it can be changed into a prime (81108187547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431426436 + ... + 431426623.

It is an arithmetic number, because the mean of its divisors is an integer number (15531355080).

Almost surely, 2^81108187546 is an apocalyptic number.

81108187546 is a deficient number, since it is larger than the sum of its proper divisors (43142653094).

81108187546 is a wasteful number, since it uses less digits than its factorization.

81108187546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862853108.

The product of its (nonzero) digits is 430080, while the sum is 49.

The spelling of 81108187546 in words is "eighty-one billion, one hundred eight million, one hundred eighty-seven thousand, five hundred forty-six".