81095186355511 has 4 divisors (see below), whose sum is σ = 81316154166112. Its totient is φ = 80874218544912.

The previous prime is 81095186355383. The next prime is 81095186355553. The reversal of 81095186355511 is 11555368159018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81095186355511 - 2⁷ = 81095186355383 is a prime.

It is a super-2 number, since 2×81095186355511² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81095186355011) 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 3 ways as a sum of consecutive naturals, for example, 110483904750 + ... + 110483905483.

It is an arithmetic number, because the mean of its divisors is an integer number (20329038541528).

Almost surely, 2^{81095186355511} is an apocalyptic number.

81095186355511 is a deficient number, since it is larger than the sum of its proper divisors (220967810601).

81095186355511 is a wasteful number, since it uses less digits than its factorization.

81095186355511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220967810600.

The product of its (nonzero) digits is 6480000, while the sum is 58.

The spelling of 81095186355511 in words is "eighty-one trillion, ninety-five billion, one hundred eighty-six million, three hundred fifty-five thousand, five hundred eleven".