81046405165 has 8 divisors (see below), whose sum is σ = 106097112288. Its totient is φ = 58942840080.

The previous prime is 81046405147. The next prime is 81046405189. The reversal of 81046405165 is 56150464018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81046405165 - 2⁵ = 81046405133 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 736785447 + ... + 736785556.

It is an arithmetic number, because the mean of its divisors is an integer number (13262139036).

Almost surely, 2^81046405165 is an apocalyptic number.

It is an amenable number.

81046405165 is a deficient number, since it is larger than the sum of its proper divisors (25050707123).

81046405165 is a wasteful number, since it uses less digits than its factorization.

81046405165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473571019.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 81046405165 in words is "eighty-one billion, forty-six million, four hundred five thousand, one hundred sixty-five".