81606484360 has 32 divisors (see below), whose sum is σ = 183622734360. Its totient is φ = 32641145856.

The previous prime is 81606484357. The next prime is 81606484373. The reversal of 81606484360 is 6348460618.

It can be written as a sum of positive squares in 4 ways, for example, as 66649683556 + 14956800804 = 258166^2 + 122298^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81606484360.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679122 + ... + 1727038.

Almost surely, 2^81606484360 is an apocalyptic number.

It is an amenable number.

81606484360 is an abundant number, since it is smaller than the sum of its proper divisors (102016250000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81606484360 is a wasteful number, since it uses less digits than its factorization.

81606484360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90505 (or 90501 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 81606484360 in words is "eighty-one billion, six hundred six million, four hundred eighty-four thousand, three hundred sixty".