81357184755 has 64 divisors (see below), whose sum is σ = 180324172800. Its totient is φ = 33810773760.

The previous prime is 81357184709. The next prime is 81357184763. The reversal of 81357184755 is 55748175318.

81357184755 is a `hidden beast` number, since 8 + 13 + 571 + 8 + 4 + 7 + 55 = 666.

It is not a de Polignac number, because 81357184755 - 2⁸ = 81357184499 is a prime.

It is a super-2 number, since 2×81357184755² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3902890 + ... + 3923679.

It is an arithmetic number, because the mean of its divisors is an integer number (2817565200).

Almost surely, 2^81357184755 is an apocalyptic number.

81357184755 is an abundant number, since it is smaller than the sum of its proper divisors (98966988045).

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

81357184755 is a wasteful number, since it uses less digits than its factorization.

81357184755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7826601 (or 7826595 counting only the distinct ones).

The product of its digits is 4704000, while the sum is 54.

The spelling of 81357184755 in words is "eighty-one billion, three hundred fifty-seven million, one hundred eighty-four thousand, seven hundred fifty-five".