81730064956 has 12 divisors (see below), whose sum is σ = 143746346800. Its totient is φ = 40659680160.

The previous prime is 81730064947. The next prime is 81730064957. The reversal of 81730064956 is 65946003718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81730064957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51337185 + ... + 51338776.

Almost surely, 2^81730064956 is an apocalyptic number.

It is an amenable number.

81730064956 is a deficient number, since it is larger than the sum of its proper divisors (62016281844).

81730064956 is a wasteful number, since it uses less digits than its factorization.

81730064956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102676164 (or 102676162 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 81730064956 in words is "eighty-one billion, seven hundred thirty million, sixty-four thousand, nine hundred fifty-six".