10381666 has 8 divisors (see below), whose sum is σ = 15598044. Its totient is φ = 5182320.

The previous prime is 10381661. The next prime is 10381667. The reversal of 10381666 is 66618301.

10381666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10106041 + 275625 = 3179^2 + 525^2 .

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

It is not an unprimeable number, because it can be changed into a prime (10381661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2605 + ... + 5248.

Almost surely, 2^10381666 is an apocalyptic number.

10381666 is a deficient number, since it is larger than the sum of its proper divisors (5216378).

10381666 is an equidigital number, since it uses as much as digits as its factorization.

10381666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8516.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 10381666 is about 3222.0592794050. The cubic root of 10381666 is about 218.1502345170.

Adding to 10381666 its reverse (66618301), we get a palindrome (76999967).

It can be divided in two parts, 1038 and 1666, that added together give a square (2704 = 52²).

The spelling of 10381666 in words is "ten million, three hundred eighty-one thousand, six hundred sixty-six".