81061016018 has 8 divisors (see below), whose sum is σ = 121930220160. Its totient is φ = 40417609300.

The previous prime is 81061015999. The next prime is 81061016051.

81061016018 is nontrivially palindromic in base 10.

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

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, 56448458 + ... + 56449893.

It is an arithmetic number, because the mean of its divisors is an integer number (15241277520).

Almost surely, 2^81061016018 is an apocalyptic number.

81061016018 is a deficient number, since it is larger than the sum of its proper divisors (40869204142).

81061016018 is a wasteful number, since it uses less digits than its factorization.

81061016018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112898712.

The product of its (nonzero) digits is 2304, while the sum is 32.

It can be divided in two parts, 810610 and 16018, that added together give a palindrome (826628).

The spelling of 81061016018 in words is "eighty-one billion, sixty-one million, sixteen thousand, eighteen".