81572189141092 has 48 divisors (see below), whose sum is σ = 157349890095552. Its totient is φ = 36763211721600.

The previous prime is 81572189141089. The next prime is 81572189141099. The reversal of 81572189141092 is 29014198127518.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81572189141099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3346863 + ... + 13204009.

It is an arithmetic number, because the mean of its divisors is an integer number (3278122710324).

Almost surely, 2^{81572189141092} is an apocalyptic number.

It is an amenable number.

81572189141092 is a deficient number, since it is larger than the sum of its proper divisors (75777700954460).

81572189141092 is a wasteful number, since it uses less digits than its factorization.

81572189141092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9860908 (or 9860906 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 58.

The spelling of 81572189141092 in words is "eighty-one trillion, five hundred seventy-two billion, one hundred eighty-nine million, one hundred forty-one thousand, ninety-two".