168949949861 has 16 divisors (see below), whose sum is σ = 210678374400. Its totient is φ = 131624639280.

The previous prime is 168949949821. The next prime is 168949949891.

168949949861 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 168949949861 - 2¹⁰ = 168949948837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168949949821) 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, 213440 + ... + 619238.

It is an arithmetic number, because the mean of its divisors is an integer number (13167398400).

Almost surely, 2^168949949861 is an apocalyptic number.

168949949861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168949949861 is a deficient number, since it is larger than the sum of its proper divisors (41728424539).

168949949861 is a wasteful number, since it uses less digits than its factorization.

168949949861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411224.

The product of its digits is 241864704, while the sum is 74.

The spelling of 168949949861 in words is "one hundred sixty-eight billion, nine hundred forty-nine million, nine hundred forty-nine thousand, eight hundred sixty-one".