9669819881 has 2 divisors, whose sum is σ = 9669819882. Its totient is φ = 9669819880.

The previous prime is 9669819877. The next prime is 9669819893. The reversal of 9669819881 is 1889189669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9502350400 + 167469481 = 97480^2 + 12941^2 .

It is an emirp because it is prime and its reverse (1889189669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9669819881 - 2² = 9669819877 is a prime.

It is a super-2 number, since 2×9669819881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9669819821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4834909940 + 4834909941.

It is an arithmetic number, because the mean of its divisors is an integer number (4834909941).

Almost surely, 2^9669819881 is an apocalyptic number.

It is an amenable number.

9669819881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9669819881 is an equidigital number, since it uses as much as digits as its factorization.

9669819881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 65.

The square root of 9669819881 is about 98335.2423142385. The cubic root of 9669819881 is about 2130.4571069625.

The spelling of 9669819881 in words is "nine billion, six hundred sixty-nine million, eight hundred nineteen thousand, eight hundred eighty-one".