81066800154450 has 48 divisors (see below), whose sum is σ = 219322542967776. Its totient is φ = 19652557612800.

The previous prime is 81066800154371. The next prime is 81066800154463. The reversal of 81066800154450 is 5445100866018.

It is a self number, because there is not a number n which added to its sum of digits gives 81066800154450.

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, 24565695367 + ... + 24565698666.

It is an arithmetic number, because the mean of its divisors is an integer number (4569219645162).

Almost surely, 2^{81066800154450} is an apocalyptic number.

81066800154450 is an abundant number, since it is smaller than the sum of its proper divisors (138255742813326).

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

81066800154450 is a wasteful number, since it uses less digits than its factorization.

81066800154450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49131394059 (or 49131394054 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 81066800154450 in words is "eighty-one trillion, sixty-six billion, eight hundred million, one hundred fifty-four thousand, four hundred fifty".