81569114870405 has 16 divisors (see below), whose sum is σ = 102139152246144. Its totient is φ = 62417839767360.

The previous prime is 81569114870393. The next prime is 81569114870443. The reversal of 81569114870405 is 50407841196518.

It is a happy number.

It is not a de Polignac number, because 81569114870405 - 2²⁰ = 81569113821829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28169870 + ... + 30930240.

It is an arithmetic number, because the mean of its divisors is an integer number (6383697015384).

Almost surely, 2^{81569114870405} is an apocalyptic number.

It is an amenable number.

81569114870405 is a deficient number, since it is larger than the sum of its proper divisors (20570037375739).

81569114870405 is a wasteful number, since it uses less digits than its factorization.

81569114870405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017356.

The product of its (nonzero) digits is 9676800, while the sum is 59.

The spelling of 81569114870405 in words is "eighty-one trillion, five hundred sixty-nine billion, one hundred fourteen million, eight hundred seventy thousand, four hundred five".