168416904961 has 4 divisors (see below), whose sum is σ = 168478172500. Its totient is φ = 168355637424.

The previous prime is 168416904911. The next prime is 168416905079. The reversal of 168416904961 is 169409614861.

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 15501495025 + 152915409936 = 124505^2 + 391044^2 .

It is a cyclic number.

It is not a de Polignac number, because 168416904961 - 2²¹ = 168414807809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168416904911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30629646 + ... + 30635143.

It is an arithmetic number, because the mean of its divisors is an integer number (42119543125).

Almost surely, 2^168416904961 is an apocalyptic number.

It is an amenable number.

168416904961 is a deficient number, since it is larger than the sum of its proper divisors (61267539).

168416904961 is an equidigital number, since it uses as much as digits as its factorization.

168416904961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61267538.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 168416904961 in words is "one hundred sixty-eight billion, four hundred sixteen million, nine hundred four thousand, nine hundred sixty-one".