81537746120611 has 32 divisors (see below), whose sum is σ = 90105948979200. Its totient is φ = 73167630053280.

The previous prime is 81537746120591. The next prime is 81537746120669. The reversal of 81537746120611 is 11602164773518.

It is a cyclic number.

It is not a de Polignac number, because 81537746120611 - 2²⁵ = 81537712566179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81537746120711) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 371423266 + ... + 371642728.

It is an arithmetic number, because the mean of its divisors is an integer number (2815810905600).

Almost surely, 2^{81537746120611} is an apocalyptic number.

81537746120611 is a deficient number, since it is larger than the sum of its proper divisors (8568202858589).

81537746120611 is a wasteful number, since it uses less digits than its factorization.

81537746120611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220719.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 81537746120611 in words is "eighty-one trillion, five hundred thirty-seven billion, seven hundred forty-six million, one hundred twenty thousand, six hundred eleven".