2168207985 has 8 divisors (see below), whose sum is σ = 3469132800. Its totient is φ = 1156377584.

The previous prime is 2168207969. The next prime is 2168208001. The reversal of 2168207985 is 5897028612.

It is an interprime number because it is at equal distance from previous prime (2168207969) and next prime (2168208001).

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

It is a cyclic number.

It is not a de Polignac number, because 2168207985 - 2⁴ = 2168207969 is a prime.

It is a super-2 number, since 2×2168207985² = 9402251732435520450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72273585 + ... + 72273614.

It is an arithmetic number, because the mean of its divisors is an integer number (433641600).

Almost surely, 2^2168207985 is an apocalyptic number.

It is an amenable number.

2168207985 is a deficient number, since it is larger than the sum of its proper divisors (1300924815).

2168207985 is a wasteful number, since it uses less digits than its factorization.

2168207985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144547207.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 2168207985 is about 46564.0202839059. The cubic root of 2168207985 is about 1294.2961117638.

The spelling of 2168207985 in words is "two billion, one hundred sixty-eight million, two hundred seven thousand, nine hundred eighty-five".