81206363630448 has 160 divisors (see below), whose sum is σ = 271827802304000. Its totient is φ = 23201818137792.

The previous prime is 81206363630443. The next prime is 81206363630453. The reversal of 81206363630448 is 84403636360218.

81206363630448 is a `hidden beast` number, since 8 + 1 + 20 + 63 + 63 + 63 + 0 + 448 = 666.

It is an interprime number because it is at equal distance from previous prime (81206363630443) and next prime (81206363630453).

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

It is a junction number, because it is equal to n+sod(n) for n = 81206363630394 and 81206363630403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81206363630443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273871786 + ... + 274168137.

It is an arithmetic number, because the mean of its divisors is an integer number (1698923764400).

Almost surely, 2^{81206363630448} is an apocalyptic number.

It is an amenable number.

81206363630448 is an abundant number, since it is smaller than the sum of its proper divisors (190621438673552).

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

81206363630448 is a wasteful number, since it uses less digits than its factorization.

81206363630448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548039961 (or 548039935 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 54.

The spelling of 81206363630448 in words is "eighty-one trillion, two hundred six billion, three hundred sixty-three million, six hundred thirty thousand, four hundred forty-eight".