81298780077132 has 72 divisors (see below), whose sum is σ = 210521742500160. Its totient is φ = 26438104001280.

The previous prime is 81298780077113. The next prime is 81298780077161. The reversal of 81298780077132 is 23177008789218.

81298780077132 is a `hidden beast` number, since 81 + 298 + 78 + 0 + 0 + 77 + 132 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81298780077132.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77810893 + ... + 78848795.

It is an arithmetic number, because the mean of its divisors is an integer number (2923913090280).

Almost surely, 2^{81298780077132} is an apocalyptic number.

81298780077132 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81298780077132 is an abundant number, since it is smaller than the sum of its proper divisors (129222962423028).

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

81298780077132 is a wasteful number, since it uses less digits than its factorization.

81298780077132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091023 (or 1091018 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 63.

The spelling of 81298780077132 in words is "eighty-one trillion, two hundred ninety-eight billion, seven hundred eighty million, seventy-seven thousand, one hundred thirty-two".