81442050871824 has 160 divisors (see below), whose sum is σ = 246079149926400. Its totient is φ = 25717844580480.

The previous prime is 81442050871807. The next prime is 81442050871871. The reversal of 81442050871824 is 42817805024418.

81442050871824 is a `hidden beast` number, since 8 + 1 + 4 + 42 + 0 + 508 + 71 + 8 + 24 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361622197 + ... + 361847339.

It is an arithmetic number, because the mean of its divisors is an integer number (1537994687040).

Almost surely, 2^{81442050871824} is an apocalyptic number.

It is an amenable number.

81442050871824 is an abundant number, since it is smaller than the sum of its proper divisors (164637099054576).

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

81442050871824 is a wasteful number, since it uses less digits than its factorization.

81442050871824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269250 (or 269238 counting only the distinct ones).

The product of its (nonzero) digits is 4587520, while the sum is 54.

The spelling of 81442050871824 in words is "eighty-one trillion, four hundred forty-two billion, fifty million, eight hundred seventy-one thousand, eight hundred twenty-four".