81036673381 has 8 divisors (see below), whose sum is σ = 81593994240. Its totient is φ = 80481171792.

The previous prime is 81036673379. The next prime is 81036673411. The reversal of 81036673381 is 18337663018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81036673381 - 2¹ = 81036673379 is a prime.

It is a super-2 number, since 2×81036673381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81036673351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365365 + ... + 543658.

It is an arithmetic number, because the mean of its divisors is an integer number (10199249280).

Almost surely, 2^81036673381 is an apocalyptic number.

It is an amenable number.

81036673381 is a deficient number, since it is larger than the sum of its proper divisors (557320859).

81036673381 is a wasteful number, since it uses less digits than its factorization.

81036673381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909635.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 81036673381 in words is "eighty-one billion, thirty-six million, six hundred seventy-three thousand, three hundred eighty-one".