168135575555 has 4 divisors (see below), whose sum is σ = 201762690672. Its totient is φ = 134508460440.

The previous prime is 168135575551. The next prime is 168135575557. The reversal of 168135575555 is 555575531861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 168135575555 - 2² = 168135575551 is a prime.

It is a super-2 number, since 2×168135575555² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168135575555.

It is not an unprimeable number, because it can be changed into a prime (168135575551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16813557551 + ... + 16813557560.

It is an arithmetic number, because the mean of its divisors is an integer number (50440672668).

Almost surely, 2^168135575555 is an apocalyptic number.

168135575555 is a deficient number, since it is larger than the sum of its proper divisors (33627115117).

168135575555 is an equidigital number, since it uses as much as digits as its factorization.

168135575555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33627115116.

The product of its digits is 15750000, while the sum is 56.

The spelling of 168135575555 in words is "one hundred sixty-eight billion, one hundred thirty-five million, five hundred seventy-five thousand, five hundred fifty-five".