81736522562 has 18 divisors (see below), whose sum is σ = 126996537369. Its totient is φ = 39453350440.

The previous prime is 81736522559. The next prime is 81736522577. The reversal of 81736522562 is 26522563718.

It can be written as a sum of positive squares in 2 ways, for example, as 81687927721 + 48594841 = 285811^2 + 6971^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202159.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11721737 + ... + 11728707.

Almost surely, 2^81736522562 is an apocalyptic number.

81736522562 is a deficient number, since it is larger than the sum of its proper divisors (45260014807).

81736522562 is an frugal number, since it uses more digits than its factorization.

81736522562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14002 (or 7002 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The spelling of 81736522562 in words is "eighty-one billion, seven hundred thirty-six million, five hundred twenty-two thousand, five hundred sixty-two".