81018974455759 has 2 divisors, whose sum is σ = 81018974455760. Its totient is φ = 81018974455758.

The previous prime is 81018974455751. The next prime is 81018974455813. The reversal of 81018974455759 is 95755447981018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81018974455759 - 2³ = 81018974455751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81018974455691 and 81018974455700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81018974455751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40509487227879 + 40509487227880.

It is an arithmetic number, because the mean of its divisors is an integer number (40509487227880).

Almost surely, 2^{81018974455759} is an apocalyptic number.

81018974455759 is a deficient number, since it is larger than the sum of its proper divisors (1).

81018974455759 is an equidigital number, since it uses as much as digits as its factorization.

81018974455759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032000, while the sum is 73.

The spelling of 81018974455759 in words is "eighty-one trillion, eighteen billion, nine hundred seventy-four million, four hundred fifty-five thousand, seven hundred fifty-nine".