81252106844 has 12 divisors (see below), whose sum is σ = 149674933800. Its totient is φ = 38487840048.

The previous prime is 81252106843. The next prime is 81252106853. The reversal of 81252106844 is 44860125218.

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 3 ways as a sum of consecutive naturals, for example, 534553259 + ... + 534553410.

It is an arithmetic number, because the mean of its divisors is an integer number (12472911150).

Almost surely, 2^81252106844 is an apocalyptic number.

It is an amenable number.

81252106844 is a deficient number, since it is larger than the sum of its proper divisors (68422826956).

81252106844 is a wasteful number, since it uses less digits than its factorization.

81252106844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069106692 (or 1069106690 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The spelling of 81252106844 in words is "eighty-one billion, two hundred fifty-two million, one hundred six thousand, eight hundred forty-four".