81331083340654 has 32 divisors (see below), whose sum is σ = 141511547750400. Its totient is φ = 34337360566080.

The previous prime is 81331083340649. The next prime is 81331083340697. The reversal of 81331083340654 is 45604338013318.

It is a super-2 number, since 2×81331083340654² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81331083340598 and 81331083340607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120093594 + ... + 120768925.

It is an arithmetic number, because the mean of its divisors is an integer number (4422235867200).

Almost surely, 2^{81331083340654} is an apocalyptic number.

81331083340654 is a deficient number, since it is larger than the sum of its proper divisors (60180464409746).

81331083340654 is a wasteful number, since it uses less digits than its factorization.

81331083340654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240862888.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 81331083340654 in words is "eighty-one trillion, three hundred thirty-one billion, eighty-three million, three hundred forty thousand, six hundred fifty-four".