81567966135 has 32 divisors (see below), whose sum is σ = 141399371520. Its totient is φ = 39991730688.

The previous prime is 81567966133. The next prime is 81567966173. The reversal of 81567966135 is 53166976518.

It is not a de Polignac number, because 81567966135 - 2¹ = 81567966133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81567966133) 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, 3708505 + ... + 3730434.

It is an arithmetic number, because the mean of its divisors is an integer number (4418730360).

Almost surely, 2^81567966135 is an apocalyptic number.

81567966135 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81567966135 is a deficient number, since it is larger than the sum of its proper divisors (59831405385).

81567966135 is a wasteful number, since it uses less digits than its factorization.

81567966135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439007.

The product of its digits is 8164800, while the sum is 57.

The spelling of 81567966135 in words is "eighty-one billion, five hundred sixty-seven million, nine hundred sixty-six thousand, one hundred thirty-five".