81306530463456 has 96 divisors (see below), whose sum is σ = 249625312876800. Its totient is φ = 25675746456960.

The previous prime is 81306530463443. The next prime is 81306530463491. The reversal of 81306530463456 is 65436403560318.

81306530463456 is a `hidden beast` number, since 8 + 1 + 3 + 0 + 6 + 530 + 4 + 63 + 45 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×81306530463456² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 2476425180 + ... + 2476458011.

It is an arithmetic number, because the mean of its divisors is an integer number (2600263675800).

Almost surely, 2^{81306530463456} is an apocalyptic number.

It is an amenable number.

81306530463456 is an abundant number, since it is smaller than the sum of its proper divisors (168318782413344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81306530463456 is a wasteful number, since it uses less digits than its factorization.

81306530463456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952883229 (or 4952883215 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 54.

The spelling of 81306530463456 in words is "eighty-one trillion, three hundred six billion, five hundred thirty million, four hundred sixty-three thousand, four hundred fifty-six".