9915661 has 8 divisors (see below), whose sum is σ = 11354624. Its totient is φ = 8482320.

The previous prime is 9915623. The next prime is 9915673. The reversal of 9915661 is 1665199.

9915661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9915661 - 2⁷ = 9915533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9915661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9915161) 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, 3556 + ... + 5698.

It is an arithmetic number, because the mean of its divisors is an integer number (1419328).

Almost surely, 2^9915661 is an apocalyptic number.

It is an amenable number.

9915661 is a deficient number, since it is larger than the sum of its proper divisors (1438963).

9915661 is a wasteful number, since it uses less digits than its factorization.

9915661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811.

The product of its digits is 14580, while the sum is 37.

The square root of 9915661 is about 3148.9142573274. The cubic root of 9915661 is about 214.8360820179.

The spelling of 9915661 in words is "nine million, nine hundred fifteen thousand, six hundred sixty-one".