81163742063039 has 4 divisors (see below), whose sum is σ = 81163760439624. Its totient is φ = 81163723686456.

The previous prime is 81163742063029. The next prime is 81163742063069. The reversal of 81163742063039 is 93036024736118.

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 81163742063039 - 2¹² = 81163742058943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81163742063029) 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, 1885424 + ... + 12879530.

It is an arithmetic number, because the mean of its divisors is an integer number (20290940109906).

Almost surely, 2^{81163742063039} is an apocalyptic number.

81163742063039 is a deficient number, since it is larger than the sum of its proper divisors (18376585).

81163742063039 is a wasteful number, since it uses less digits than its factorization.

81163742063039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18376584.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 81163742063039 in words is "eighty-one trillion, one hundred sixty-three billion, seven hundred forty-two million, sixty-three thousand, thirty-nine".