2168905857 has 8 divisors (see below), whose sum is σ = 2892146880. Its totient is φ = 1445801040.

The previous prime is 2168905831. The next prime is 2168905889. The reversal of 2168905857 is 7585098612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2168905857 - 2¹⁰ = 2168904833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2168905357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12007 + ... + 66947.

It is an arithmetic number, because the mean of its divisors is an integer number (361518360).

Almost surely, 2^2168905857 is an apocalyptic number.

It is an amenable number.

2168905857 is a deficient number, since it is larger than the sum of its proper divisors (723241023).

2168905857 is a wasteful number, since it uses less digits than its factorization.

2168905857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68103.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The square root of 2168905857 is about 46571.5133638580. The cubic root of 2168905857 is about 1294.4349600863.

The spelling of 2168905857 in words is "two billion, one hundred sixty-eight million, nine hundred five thousand, eight hundred fifty-seven".