81733857454369 has 2 divisors, whose sum is σ = 81733857454370. Its totient is φ = 81733857454368.

The previous prime is 81733857454343. The next prime is 81733857454429. The reversal of 81733857454369 is 96345475833718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55498328078400 + 26235529375969 = 7449720^2 + 5122063^2 .

It is a cyclic number.

It is not a de Polignac number, because 81733857454369 - 2²⁹ = 81733320583457 is a prime.

It is a super-2 number, since 2×81733857454369² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81733857458369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866928727184 + 40866928727185.

It is an arithmetic number, because the mean of its divisors is an integer number (40866928727185).

Almost surely, 2^{81733857454369} is an apocalyptic number.

It is an amenable number.

81733857454369 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733857454369 is an equidigital number, since it uses as much as digits as its factorization.

81733857454369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1828915200, while the sum is 73.

The spelling of 81733857454369 in words is "eighty-one trillion, seven hundred thirty-three billion, eight hundred fifty-seven million, four hundred fifty-four thousand, three hundred sixty-nine".