10215666 has 32 divisors (see below), whose sum is σ = 22881600. Its totient is φ = 3378240.

The previous prime is 10215661. The next prime is 10215671. The reversal of 10215666 is 66651201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10215661) and next prime (10215671).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (10215661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6826 + ... + 8186.

It is an arithmetic number, because the mean of its divisors is an integer number (715050).

Almost surely, 2^10215666 is an apocalyptic number.

10215666 is an abundant number, since it is smaller than the sum of its proper divisors (12665934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10215666 is a wasteful number, since it uses less digits than its factorization.

10215666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 10215666 is about 3196.1955509637. The cubic root of 10215666 is about 216.9812608139.

Adding to 10215666 its reverse (66651201), we get a palindrome (76866867).

The spelling of 10215666 in words is "ten million, two hundred fifteen thousand, six hundred sixty-six".