9900799969 has 4 divisors (see below), whose sum is σ = 9901372096. Its totient is φ = 9900227844.

The previous prime is 9900799967. The next prime is 9900799999. The reversal of 9900799969 is 9699970099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9699970099 = 1163 ⋅8340473.

It is a cyclic number.

It is not a de Polignac number, because 9900799969 - 2¹ = 9900799967 is a prime.

It is a super-2 number, since 2×9900799969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9900799963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259269 + ... + 294994.

It is an arithmetic number, because the mean of its divisors is an integer number (2475343024).

Almost surely, 2^9900799969 is an apocalyptic number.

It is an amenable number.

9900799969 is a deficient number, since it is larger than the sum of its proper divisors (572127).

9900799969 is a wasteful number, since it uses less digits than its factorization.

9900799969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572126.

The product of its (nonzero) digits is 22320522, while the sum is 67.

The square root of 9900799969 is about 99502.7636249366. The cubic root of 9900799969 is about 2147.2870030427.

The spelling of 9900799969 in words is "nine billion, nine hundred million, seven hundred ninety-nine thousand, nine hundred sixty-nine".