81115435364 has 12 divisors (see below), whose sum is σ = 141957443964. Its totient is φ = 40556165664.

The previous prime is 81115435351. The next prime is 81115435409. The reversal of 81115435364 is 46353451118.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72141662464 + 8973772900 = 268592^2 + 94730^2 .

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, 266159 + ... + 482774.

It is an arithmetic number, because the mean of its divisors is an integer number (11829786997).

Almost surely, 2^81115435364 is an apocalyptic number.

It is an amenable number.

81115435364 is a deficient number, since it is larger than the sum of its proper divisors (60842008600).

81115435364 is a wasteful number, since it uses less digits than its factorization.

81115435364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776014 (or 776012 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 81115435364 in words is "eighty-one billion, one hundred fifteen million, four hundred thirty-five thousand, three hundred sixty-four".