81017166733 has 4 divisors (see below), whose sum is σ = 85281228160. Its totient is φ = 76753105308.

The previous prime is 81017166709. The next prime is 81017166739. The reversal of 81017166733 is 33766171018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81017166733 - 2²⁹ = 80480295821 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 81017166733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81017166739) 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, 2132030685 + ... + 2132030722.

It is an arithmetic number, because the mean of its divisors is an integer number (21320307040).

Almost surely, 2^81017166733 is an apocalyptic number.

It is an amenable number.

81017166733 is a deficient number, since it is larger than the sum of its proper divisors (4264061427).

81017166733 is a wasteful number, since it uses less digits than its factorization.

81017166733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264061426.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 81017166733 in words is "eighty-one billion, seventeen million, one hundred sixty-six thousand, seven hundred thirty-three".