81356066935 has 16 divisors (see below), whose sum is σ = 114694987680. Its totient is φ = 54616659840.

The previous prime is 81356066933. The next prime is 81356066941. The reversal of 81356066935 is 53966065318.

It is not a de Polignac number, because 81356066935 - 2¹ = 81356066933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81356066933) 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, 56891640 + ... + 56893069.

It is an arithmetic number, because the mean of its divisors is an integer number (7168436730).

Almost surely, 2^81356066935 is an apocalyptic number.

81356066935 is a deficient number, since it is larger than the sum of its proper divisors (33338920745).

81356066935 is a wasteful number, since it uses less digits than its factorization.

81356066935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113784738.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 81356066935 in words is "eighty-one billion, three hundred fifty-six million, sixty-six thousand, nine hundred thirty-five".