81259502180502 has 16 divisors (see below), whose sum is σ = 162617084649072. Its totient is φ = 27070154012160.

The previous prime is 81259502180477. The next prime is 81259502180543. The reversal of 81259502180502 is 20508120595218.

81259502180502 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4086667899 + ... + 4086687782.

It is an arithmetic number, because the mean of its divisors is an integer number (10163567790567).

Almost surely, 2^{81259502180502} is an apocalyptic number.

81259502180502 is an abundant number, since it is smaller than the sum of its proper divisors (81357582468570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81259502180502 is a wasteful number, since it uses less digits than its factorization.

81259502180502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8173357343.

The product of its (nonzero) digits is 576000, while the sum is 48.

The spelling of 81259502180502 in words is "eighty-one trillion, two hundred fifty-nine billion, five hundred two million, one hundred eighty thousand, five hundred two".