9640686969 has 27 divisors (see below), whose sum is σ = 14567451717. Its totient is φ = 6143364216.

The previous prime is 9640686943. The next prime is 9640687003. The reversal of 9640686969 is 9696860469.

The square root of 9640686969 is 98187.

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

9640686969 is a `hidden beast` number, since 96 + 406 + 86 + 9 + 69 = 666.

It is not a de Polignac number, because 9640686969 - 2⁷ = 9640686841 is a prime.

It is a super-2 number, since 2×9640686969² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9640686919) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6774192 + ... + 6775614.

Almost surely, 2^9640686969 is an apocalyptic number.

9640686969 is the 98187-th square number.

9640686969 is the 49094-th centered octagonal number.

It is an amenable number.

9640686969 is a deficient number, since it is larger than the sum of its proper divisors (4926764748).

9640686969 is an equidigital number, since it uses as much as digits as its factorization.

9640686969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 63.

The cubic root of 9640686969 is about 2128.3154312724.

The spelling of 9640686969 in words is "nine billion, six hundred forty million, six hundred eighty-six thousand, nine hundred sixty-nine".