135865447881 has 8 divisors (see below), whose sum is σ = 183336508320. Its totient is φ = 89485676352.

The previous prime is 135865447849. The next prime is 135865447889. The reversal of 135865447881 is 188744568531.

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

It is not a de Polignac number, because 135865447881 - 2⁵ = 135865447849 is a prime.

It is a super-2 number, since 2×135865447881² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (135865447889) 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, 272821936 + ... + 272822433.

It is an arithmetic number, because the mean of its divisors is an integer number (22917063540).

Almost surely, 2^135865447881 is an apocalyptic number.

It is an amenable number.

135865447881 is a deficient number, since it is larger than the sum of its proper divisors (47471060439).

135865447881 is an equidigital number, since it uses as much as digits as its factorization.

135865447881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545644455.

The product of its digits is 25804800, while the sum is 60.

The spelling of 135865447881 in words is "one hundred thirty-five billion, eight hundred sixty-five million, four hundred forty-seven thousand, eight hundred eighty-one".