81896069818 has 8 divisors (see below), whose sum is σ = 123178830912. Its totient is φ = 40836459516.

The previous prime is 81896069813. The next prime is 81896069821.

81896069818 is nontrivially palindromic in base 10.

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 81896069818.

It is not an unprimeable number, because it can be changed into a prime (81896069813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55786780 + ... + 55788247.

It is an arithmetic number, because the mean of its divisors is an integer number (15397353864).

Almost surely, 2^81896069818 is an apocalyptic number.

81896069818 is a deficient number, since it is larger than the sum of its proper divisors (41282761094).

81896069818 is a wasteful number, since it uses less digits than its factorization.

81896069818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111575396.

The product of its (nonzero) digits is 11943936, while the sum is 64.

The spelling of 81896069818 in words is "eighty-one billion, eight hundred ninety-six million, sixty-nine thousand, eight hundred eighteen".