81013117680749 has 16 divisors (see below), whose sum is σ = 81502133346816. Its totient is φ = 80524567972800.

The previous prime is 81013117680739. The next prime is 81013117680751. The reversal of 81013117680749 is 94708671131018.

It is a cyclic number.

It is not a de Polignac number, because 81013117680749 - 2⁸ = 81013117680493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81013117680694 and 81013117680703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81013117680709) 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, 4283905604 + ... + 4283924514.

It is an arithmetic number, because the mean of its divisors is an integer number (5093883334176).

Almost surely, 2^{81013117680749} is an apocalyptic number.

It is an amenable number.

81013117680749 is a deficient number, since it is larger than the sum of its proper divisors (489015666067).

81013117680749 is a wasteful number, since it uses less digits than its factorization.

81013117680749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29876.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 81013117680749 in words is "eighty-one trillion, thirteen billion, one hundred seventeen million, six hundred eighty thousand, seven hundred forty-nine".