81702389475 has 288 divisors, whose sum is σ = 181533381120. Its totient is φ = 35637719040.

The previous prime is 81702389443. The next prime is 81702389491. The reversal of 81702389475 is 57498320718.

It is a happy number.

81702389475 is a `hidden beast` number, since 8 + 1 + 70 + 23 + 89 + 475 = 666.

It is not a de Polignac number, because 81702389475 - 2⁵ = 81702389443 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 119622484 + ... + 119623166.

It is an arithmetic number, because the mean of its divisors is an integer number (630324240).

Almost surely, 2^81702389475 is an apocalyptic number.

81702389475 is an abundant number, since it is smaller than the sum of its proper divisors (99830991645).

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

81702389475 is a wasteful number, since it uses less digits than its factorization.

81702389475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 81702389475 in words is "eighty-one billion, seven hundred two million, three hundred eighty-nine thousand, four hundred seventy-five".