9640666401 has 8 divisors (see below), whose sum is σ = 12866456544. Its totient is φ = 6420993600.

The previous prime is 9640666351. The next prime is 9640666433. The reversal of 9640666401 is 1046660469.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9640666401 - 2⁶ = 9640666337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9640666001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525656 + ... + 1531961.

It is an arithmetic number, because the mean of its divisors is an integer number (1608307068).

Almost surely, 2^9640666401 is an apocalyptic number.

It is an amenable number.

9640666401 is a deficient number, since it is larger than the sum of its proper divisors (3225790143).

9640666401 is a wasteful number, since it uses less digits than its factorization.

9640666401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058671.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 9640666401 is about 98186.8952610276. The cubic root of 9640666401 is about 2128.3139177141.

The spelling of 9640666401 in words is "nine billion, six hundred forty million, six hundred sixty-six thousand, four hundred one".