81572189141093 has 16 divisors (see below), whose sum is σ = 94840494403200. Its totient is φ = 68709768955200.

The previous prime is 81572189141089. The next prime is 81572189141099. The reversal of 81572189141093 is 39014198127518.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81572189141093 - 2² = 81572189141089 is a prime.

It is a super-2 number, since 2×81572189141093² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87084818 + ... + 88016531.

It is an arithmetic number, because the mean of its divisors is an integer number (5927530900200).

Almost surely, 2^{81572189141093} is an apocalyptic number.

It is an amenable number.

81572189141093 is a deficient number, since it is larger than the sum of its proper divisors (13268305262107).

81572189141093 is a wasteful number, since it uses less digits than its factorization.

81572189141093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175102508.

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 81572189141093 in words is "eighty-one trillion, five hundred seventy-two billion, one hundred eighty-nine million, one hundred forty-one thousand, ninety-three".