81063379663 has 24 divisors (see below), whose sum is σ = 96315855792. Its totient is φ = 68009445504.

The previous prime is 81063379613. The next prime is 81063379721. The reversal of 81063379663 is 36697336018.

It is a de Polignac number, because none of the positive numbers 2^k-81063379663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81063379663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81063379613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436795 + ... + 594067.

It is an arithmetic number, because the mean of its divisors is an integer number (4013160658).

Almost surely, 2^81063379663 is an apocalyptic number.

81063379663 is a deficient number, since it is larger than the sum of its proper divisors (15252476129).

81063379663 is a wasteful number, since it uses less digits than its factorization.

81063379663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157511 (or 157504 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 52.

The spelling of 81063379663 in words is "eighty-one billion, sixty-three million, three hundred seventy-nine thousand, six hundred sixty-three".