81452673168840 has 224 divisors, whose sum is σ = 289239026572800. Its totient is φ = 20577517292160.

The previous prime is 81452673168829. The next prime is 81452673168871. The reversal of 81452673168840 is 4886137625418.

81452673168840 is a `hidden beast` number, since 8 + 1 + 4 + 526 + 7 + 3 + 1 + 68 + 8 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 72953896 + ... + 74061975.

Almost surely, 2^{81452673168840} is an apocalyptic number.

It is an amenable number.

81452673168840 is an abundant number, since it is smaller than the sum of its proper divisors (207786353403960).

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

81452673168840 is a wasteful number, since it uses less digits than its factorization.

81452673168840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147015919 (or 147015900 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 63.

The spelling of 81452673168840 in words is "eighty-one trillion, four hundred fifty-two billion, six hundred seventy-three million, one hundred sixty-eight thousand, eight hundred forty".