10649666 has 4 divisors (see below), whose sum is σ = 15974502. Its totient is φ = 5324832.

The previous prime is 10649663. The next prime is 10649693. The reversal of 10649666 is 66694601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66694601 = 769 ⋅86729.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 758641 = 3145^2 + 871^2 .

It is a super-2 number, since 2×10649666² = 226830771823112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10649663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2662415 + ... + 2662418.

Almost surely, 2^10649666 is an apocalyptic number.

10649666 is a deficient number, since it is larger than the sum of its proper divisors (5324836).

10649666 is an equidigital number, since it uses as much as digits as its factorization.

10649666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324835.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 10649666 is about 3263.3826009219. The cubic root of 10649666 is about 220.0114732308.

The spelling of 10649666 in words is "ten million, six hundred forty-nine thousand, six hundred sixty-six".