81552025518 has 8 divisors (see below), whose sum is σ = 163104051048. Its totient is φ = 27184008504.

The previous prime is 81552025487. The next prime is 81552025553.

81552025518 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

81552025518 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81552025518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6796002121 + ... + 6796002132.

It is an arithmetic number, because the mean of its divisors is an integer number (20388006381).

Almost surely, 2^81552025518 is an apocalyptic number.

81552025518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81552025518 is a wasteful number, since it uses less digits than its factorization.

81552025518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13592004258.

The product of its (nonzero) digits is 160000, while the sum is 42.

The spelling of 81552025518 in words is "eighty-one billion, five hundred fifty-two million, twenty-five thousand, five hundred eighteen".