168210191409 has 16 divisors (see below), whose sum is σ = 252034000512. Its totient is φ = 99013356288.

The previous prime is 168210191399. The next prime is 168210191447. The reversal of 168210191409 is 904191012861.

It is not a de Polignac number, because 168210191409 - 2¹¹ = 168210189361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168210191459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93761752 + ... + 93763545.

It is an arithmetic number, because the mean of its divisors is an integer number (15752125032).

Almost surely, 2^168210191409 is an apocalyptic number.

It is an amenable number.

168210191409 is a deficient number, since it is larger than the sum of its proper divisors (83823809103).

168210191409 is a wasteful number, since it uses less digits than its factorization.

168210191409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187525336.

The product of its (nonzero) digits is 31104, while the sum is 42.

The spelling of 168210191409 in words is "one hundred sixty-eight billion, two hundred ten million, one hundred ninety-one thousand, four hundred nine".