10661818 has 4 divisors (see below), whose sum is σ = 15992730. Its totient is φ = 5330908.

The previous prime is 10661813. The next prime is 10661843. The reversal of 10661818 is 81816601.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8450649 + 2211169 = 2907^2 + 1487^2 .

It is a super-2 number, since 2×10661818² = 227348726130248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

10661818 is a modest number, since divided by 1818 gives 1066 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 10661818.

It is not an unprimeable number, because it can be changed into a prime (10661813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665453 + ... + 2665456.

Almost surely, 2^10661818 is an apocalyptic number.

10661818 is a deficient number, since it is larger than the sum of its proper divisors (5330912).

10661818 is an equidigital number, since it uses as much as digits as its factorization.

10661818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330911.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 10661818 is about 3265.2439418824. The cubic root of 10661818 is about 220.0951241533.

The spelling of 10661818 in words is "ten million, six hundred sixty-one thousand, eight hundred eighteen".