81435453418 has 32 divisors (see below), whose sum is σ = 134697390912. Its totient is φ = 36616944000.

The previous prime is 81435453397. The next prime is 81435453419.

81435453418 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (81435453419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2568430 + ... + 2599942.

It is an arithmetic number, because the mean of its divisors is an integer number (4209293466).

Almost surely, 2^81435453418 is an apocalyptic number.

81435453418 is a deficient number, since it is larger than the sum of its proper divisors (53261937494).

81435453418 is a wasteful number, since it uses less digits than its factorization.

81435453418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32790.

The product of its digits is 921600, while the sum is 46.

The spelling of 81435453418 in words is "eighty-one billion, four hundred thirty-five million, four hundred fifty-three thousand, four hundred eighteen".