81799151617 has 8 divisors (see below), whose sum is σ = 87830739072. Its totient is φ = 75903105600.

The previous prime is 81799151611. The next prime is 81799151627. The reversal of 81799151617 is 71615199718.

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

It is a cyclic number.

It is not a de Polignac number, because 81799151617 - 2²³ = 81790763009 is a prime.

It is a super-2 number, since 2×81799151617² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81799151611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33884109 + ... + 33886522.

It is an arithmetic number, because the mean of its divisors is an integer number (10978842384).

Almost surely, 2^81799151617 is an apocalyptic number.

It is an amenable number.

81799151617 is a deficient number, since it is larger than the sum of its proper divisors (6031587455).

81799151617 is a wasteful number, since it uses less digits than its factorization.

81799151617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67770719.

The product of its digits is 952560, while the sum is 55.

The spelling of 81799151617 in words is "eighty-one billion, seven hundred ninety-nine million, one hundred fifty-one thousand, six hundred seventeen".