81852411487 has 32 divisors (see below), whose sum is σ = 103119151104. Its totient is φ = 63116236800.

The previous prime is 81852411481. The next prime is 81852411491. The reversal of 81852411487 is 78411425818.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81852411487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81852411487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81852411481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2824033 + ... + 2852869.

It is an arithmetic number, because the mean of its divisors is an integer number (3222473472).

Almost surely, 2^81852411487 is an apocalyptic number.

81852411487 is a deficient number, since it is larger than the sum of its proper divisors (21266739617).

81852411487 is a wasteful number, since it uses less digits than its factorization.

81852411487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29239.

The product of its digits is 573440, while the sum is 49.

The spelling of 81852411487 in words is "eighty-one billion, eight hundred fifty-two million, four hundred eleven thousand, four hundred eighty-seven".