81252106845 has 32 divisors (see below), whose sum is σ = 160004151552. Its totient is φ = 34286602752.

The previous prime is 81252106843. The next prime is 81252106853. The reversal of 81252106845 is 54860125218.

It is not a de Polignac number, because 81252106845 - 2¹ = 81252106843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81252106797 and 81252106806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252106843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29761312 + ... + 29764041.

It is an arithmetic number, because the mean of its divisors is an integer number (5000129736).

Almost surely, 2^81252106845 is an apocalyptic number.

It is an amenable number.

81252106845 is a deficient number, since it is larger than the sum of its proper divisors (78752044707).

81252106845 is a wasteful number, since it uses less digits than its factorization.

81252106845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59525381.

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 81252106845 in words is "eighty-one billion, two hundred fifty-two million, one hundred six thousand, eight hundred forty-five".