81075560215 has 16 divisors (see below), whose sum is σ = 104797123200. Its totient is φ = 59858295552.

The previous prime is 81075560213. The next prime is 81075560221. The reversal of 81075560215 is 51206557018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81075560215 - 2¹ = 81075560213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81075560213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175506 + ... + 439264.

It is an arithmetic number, because the mean of its divisors is an integer number (6549820200).

Almost surely, 2^81075560215 is an apocalyptic number.

81075560215 is a deficient number, since it is larger than the sum of its proper divisors (23721562985).

81075560215 is a wasteful number, since it uses less digits than its factorization.

81075560215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268506.

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 81075560215 in words is "eighty-one billion, seventy-five million, five hundred sixty thousand, two hundred fifteen".