168648955553 has 4 divisors (see below), whose sum is σ = 181621952148. Its totient is φ = 155675958960.

The previous prime is 168648955543. The next prime is 168648955577. The reversal of 168648955553 is 355559846861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77344059664 + 91304895889 = 278108^2 + 302167^2 .

It is a cyclic number.

It is not a de Polignac number, because 168648955553 - 2²² = 168644761249 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168648955553.

It is not an unprimeable number, because it can be changed into a prime (168648955543) 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, 6486498278 + ... + 6486498303.

It is an arithmetic number, because the mean of its divisors is an integer number (45405488037).

Almost surely, 2^168648955553 is an apocalyptic number.

168648955553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

168648955553 is a deficient number, since it is larger than the sum of its proper divisors (12972996595).

168648955553 is a wasteful number, since it uses less digits than its factorization.

168648955553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12972996594.

The product of its digits is 155520000, while the sum is 65.

The spelling of 168648955553 in words is "one hundred sixty-eight billion, six hundred forty-eight million, nine hundred fifty-five thousand, five hundred fifty-three".