9885911890969 has 9 divisors (see below), whose sum is σ = 9901944880543. Its totient is φ = 9869904834952.

The previous prime is 9885911890927. The next prime is 9885911890993. The reversal of 9885911890969 is 9690981195889.

The square root of 9885911890969 is 3144187.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5681000745225 + 4204911145744 = 2383485^2 + 2050588^2 .

It is not a de Polignac number, because 9885911890969 - 2⁹ = 9885911890457 is a prime.

It is a super-2 number, since 2×9885911890969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9885911890892 and 9885911890901.

It is not an unprimeable number, because it can be changed into a prime (9885911890669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2260668267 + ... + 2260672639.

Almost surely, 2^{9885911890969} is an apocalyptic number.

9885911890969 is the 3144187-th square number.

9885911890969 is the 1572094-th centered octagonal number.

It is an amenable number.

9885911890969 is a deficient number, since it is larger than the sum of its proper divisors (16032989574).

9885911890969 is an frugal number, since it uses more digits than its factorization.

9885911890969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10184 (or 5092 counting only the distinct ones).

The product of its (nonzero) digits is 906992640, while the sum is 82.

The spelling of 9885911890969 in words is "nine trillion, eight hundred eighty-five billion, nine hundred eleven million, eight hundred ninety thousand, nine hundred sixty-nine".