81635616482033 has 4 divisors (see below), whose sum is σ = 81636134510580. Its totient is φ = 81635098453488.

The previous prime is 81635616482023. The next prime is 81635616482039. The reversal of 81635616482033 is 33028461653618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66311429371489 + 15324187110544 = 8143183^2 + 3914612^2 .

It is a cyclic number.

It is not a de Polignac number, because 81635616482033 - 2²² = 81635612287729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81635616482033.

It is not an unprimeable number, because it can be changed into a prime (81635616482039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258777818 + ... + 259093091.

It is an arithmetic number, because the mean of its divisors is an integer number (20409033627645).

Almost surely, 2^{81635616482033} is an apocalyptic number.

It is an amenable number.

81635616482033 is a deficient number, since it is larger than the sum of its proper divisors (518028547).

81635616482033 is a wasteful number, since it uses less digits than its factorization.

81635616482033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518028546.

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 81635616482033 in words is "eighty-one trillion, six hundred thirty-five billion, six hundred sixteen million, four hundred eighty-two thousand, thirty-three".