9997665 has 8 divisors (see below), whose sum is σ = 15996288. Its totient is φ = 5332080.

The previous prime is 9997661. The next prime is 9997697. The reversal of 9997665 is 5667999.

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

It is not a de Polignac number, because 9997665 - 2² = 9997661 is a prime.

9997665 is a lucky number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9997661) 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, 333241 + ... + 333270.

It is an arithmetic number, because the mean of its divisors is an integer number (1999536).

Almost surely, 2^9997665 is an apocalyptic number.

It is an amenable number.

9997665 is a deficient number, since it is larger than the sum of its proper divisors (5998623).

9997665 is a wasteful number, since it uses less digits than its factorization.

9997665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666519.

The product of its digits is 918540, while the sum is 51.

The square root of 9997665 is about 3161.9084426972. The cubic root of 9997665 is about 215.4266990145.

The spelling of 9997665 in words is "nine million, nine hundred ninety-seven thousand, six hundred sixty-five".