10216661 has 24 divisors (see below), whose sum is σ = 13313664. Its totient is φ = 7633440.

The previous prime is 10216649. The next prime is 10216663. The reversal of 10216661 is 16661201.

10216661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10216661 - 2⁶ = 10216597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10216663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32696 + ... + 33006.

It is an arithmetic number, because the mean of its divisors is an integer number (554736).

Almost surely, 2^10216661 is an apocalyptic number.

It is an amenable number.

10216661 is a deficient number, since it is larger than the sum of its proper divisors (3097003).

10216661 is a wasteful number, since it uses less digits than its factorization.

10216661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 10216661 is about 3196.3512009790. The cubic root of 10216661 is about 216.9883052020.

Adding to 10216661 its reverse (16661201), we get a palindrome (26877862).

The spelling of 10216661 in words is "ten million, two hundred sixteen thousand, six hundred sixty-one".