81843288502 has 16 divisors (see below), whose sum is σ = 124179543072. Its totient is φ = 40451535360.

The previous prime is 81843288497. The next prime is 81843288509. The reversal of 81843288502 is 20588234818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81843288509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241899 + ... + 471382.

It is an arithmetic number, because the mean of its divisors is an integer number (7761221442).

Almost surely, 2^81843288502 is an apocalyptic number.

81843288502 is a deficient number, since it is larger than the sum of its proper divisors (42336254570).

81843288502 is a wasteful number, since it uses less digits than its factorization.

81843288502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713943.

The product of its (nonzero) digits is 983040, while the sum is 49.

The spelling of 81843288502 in words is "eighty-one billion, eight hundred forty-three million, two hundred eighty-eight thousand, five hundred two".