81687813153 has 8 divisors (see below), whose sum is σ = 114649562400. Its totient is φ = 51592303008.

The previous prime is 81687813149. The next prime is 81687813161. The reversal of 81687813153 is 35131878618.

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

It is not a de Polignac number, because 81687813153 - 2² = 81687813149 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81687813096 and 81687813105.

It is not an unprimeable number, because it can be changed into a prime (81687813353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716559708 + ... + 716559821.

It is an arithmetic number, because the mean of its divisors is an integer number (14331195300).

Almost surely, 2^81687813153 is an apocalyptic number.

It is an amenable number.

81687813153 is a deficient number, since it is larger than the sum of its proper divisors (32961749247).

81687813153 is a wasteful number, since it uses less digits than its factorization.

81687813153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433119551.

The product of its digits is 967680, while the sum is 51.

The spelling of 81687813153 in words is "eighty-one billion, six hundred eighty-seven million, eight hundred thirteen thousand, one hundred fifty-three".