9878664211 has 16 divisors (see below), whose sum is σ = 10911378016. Its totient is φ = 8885915136.

The previous prime is 9878664199. The next prime is 9878664239. The reversal of 9878664211 is 1124668789.

It is a cyclic number.

It is not a de Polignac number, because 9878664211 - 2⁷ = 9878664083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878664241) 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, 221641 + ... + 262453.

It is an arithmetic number, because the mean of its divisors is an integer number (681961126).

Almost surely, 2^9878664211 is an apocalyptic number.

9878664211 is a deficient number, since it is larger than the sum of its proper divisors (1032713805).

9878664211 is a wasteful number, since it uses less digits than its factorization.

9878664211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41302.

The product of its digits is 1161216, while the sum is 52.

The square root of 9878664211 is about 99391.4695082028. The cubic root of 9878664211 is about 2145.6855401026.

The spelling of 9878664211 in words is "nine billion, eight hundred seventy-eight million, six hundred sixty-four thousand, two hundred eleven".