81889581502 has 16 divisors (see below), whose sum is σ = 130676332752. Its totient is φ = 38353633920.

The previous prime is 81889581481. The next prime is 81889581509. The reversal of 81889581502 is 20518598818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81889581509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5700213 + ... + 5714560.

It is an arithmetic number, because the mean of its divisors is an integer number (8167270797).

Almost surely, 2^81889581502 is an apocalyptic number.

81889581502 is a deficient number, since it is larger than the sum of its proper divisors (48786751250).

81889581502 is a wasteful number, since it uses less digits than its factorization.

81889581502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11415003.

The product of its (nonzero) digits is 1843200, while the sum is 55.

The spelling of 81889581502 in words is "eighty-one billion, eight hundred eighty-nine million, five hundred eighty-one thousand, five hundred two".