9909672681 has 4 divisors (see below), whose sum is σ = 13212896912. Its totient is φ = 6606448452.

The previous prime is 9909672611. The next prime is 9909672683. The reversal of 9909672681 is 1862769099.

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.

It is not a de Polignac number, because 9909672681 - 2¹¹ = 9909670633 is a prime.

It is a super-2 number, since 2×9909672681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9909672683) 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, 1651612111 + ... + 1651612116.

It is an arithmetic number, because the mean of its divisors is an integer number (3303224228).

Almost surely, 2^9909672681 is an apocalyptic number.

It is an amenable number.

9909672681 is a deficient number, since it is larger than the sum of its proper divisors (3303224231).

9909672681 is a wasteful number, since it uses less digits than its factorization.

9909672681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303224230.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The square root of 9909672681 is about 99547.3388946184. The cubic root of 9909672681 is about 2147.9282499033.

The spelling of 9909672681 in words is "nine billion, nine hundred nine million, six hundred seventy-two thousand, six hundred eighty-one".