81473773336681 has 16 divisors (see below), whose sum is σ = 88984681049088. Its totient is φ = 73980255830800.

The previous prime is 81473773336679. The next prime is 81473773336687. The reversal of 81473773336681 is 18663337737418.

It is not a de Polignac number, because 81473773336681 - 2¹ = 81473773336679 is a prime.

It is a super-2 number, since 2×81473773336681² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81473773336687) 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, 69606780 + ... + 70767586.

It is an arithmetic number, because the mean of its divisors is an integer number (5561542565568).

Almost surely, 2^{81473773336681} is an apocalyptic number.

It is an amenable number.

81473773336681 is a deficient number, since it is larger than the sum of its proper divisors (7510907712407).

81473773336681 is a wasteful number, since it uses less digits than its factorization.

81473773336681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168292.

The product of its digits is 256048128, while the sum is 67.

The spelling of 81473773336681 in words is "eighty-one trillion, four hundred seventy-three billion, seven hundred seventy-three million, three hundred thirty-six thousand, six hundred eighty-one".