81611524438 has 8 divisors (see below), whose sum is σ = 123540381360. Its totient is φ = 40431397320.

The previous prime is 81611524417. The next prime is 81611524459. The reversal of 81611524438 is 83442511618.

It is an interprime number because it is at equal distance from previous prime (81611524417) and next prime (81611524459).

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

It is a junction number, because it is equal to n+sod(n) for n = 81611524394 and 81611524403.

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, 187182178 + ... + 187182613.

It is an arithmetic number, because the mean of its divisors is an integer number (15442547670).

Almost surely, 2^81611524438 is an apocalyptic number.

81611524438 is a deficient number, since it is larger than the sum of its proper divisors (41928856922).

81611524438 is a wasteful number, since it uses less digits than its factorization.

81611524438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374364902.

The product of its digits is 184320, while the sum is 43.

The spelling of 81611524438 in words is "eighty-one billion, six hundred eleven million, five hundred twenty-four thousand, four hundred thirty-eight".