81046565416 has 48 divisors (see below), whose sum is σ = 157218452820. Its totient is φ = 39167136000.

The previous prime is 81046565351. The next prime is 81046565429. The reversal of 81046565416 is 61456564018.

It can be written as a sum of positive squares in 2 ways, for example, as 78430242916 + 2616322500 = 280054^2 + 51150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6582466 + ... + 6594766.

Almost surely, 2^81046565416 is an apocalyptic number.

It is an amenable number.

81046565416 is a deficient number, since it is larger than the sum of its proper divisors (76171887404).

81046565416 is a wasteful number, since it uses less digits than its factorization.

81046565416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13226 (or 13191 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 81046565416 in words is "eighty-one billion, forty-six million, five hundred sixty-five thousand, four hundred sixteen".