81550076878332 has 60 divisors (see below), whose sum is σ = 214080009860640. Its totient is φ = 27069621030144.

The previous prime is 81550076878331. The next prime is 81550076878357. The reversal of 81550076878332 is 23387867005518.

81550076878332 is a `hidden beast` number, since 8 + 1 + 550 + 0 + 7 + 6 + 8 + 78 + 3 + 3 + 2 = 666.

It is a super-4 number, since 4×81550076878332⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 81550076878332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81550076878331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 526486933 + ... + 526641804.

It is an arithmetic number, because the mean of its divisors is an integer number (3568000164344).

Almost surely, 2^{81550076878332} is an apocalyptic number.

It is an amenable number.

81550076878332 is an abundant number, since it is smaller than the sum of its proper divisors (132529932982308).

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

81550076878332 is a wasteful number, since it uses less digits than its factorization.

81550076878332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053128992 (or 1053128981 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 63.

The spelling of 81550076878332 in words is "eighty-one trillion, five hundred fifty billion, seventy-six million, eight hundred seventy-eight thousand, three hundred thirty-two".