10661111 has 2 divisors, whose sum is σ = 10661112. Its totient is φ = 10661110.

The previous prime is 10661089. The next prime is 10661171. The reversal of 10661111 is 11116601.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10661111 is a prime.

It is a super-2 number, since 2×10661111² = 227318575508642, which contains 22 as substring.

It is a Chen prime.

10661111 is a modest number, since divided by 1111 gives 1066 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 10661111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10661171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330555 + 5330556.

It is an arithmetic number, because the mean of its divisors is an integer number (5330556).

Almost surely, 2^10661111 is an apocalyptic number.

10661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661111 is an equidigital number, since it uses as much as digits as its factorization.

10661111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 10661111 is about 3265.1356786510. The cubic root of 10661111 is about 220.0902591077.

Adding to 10661111 its reverse (11116601), we get a palindrome (21777712).

The spelling of 10661111 in words is "ten million, six hundred sixty-one thousand, one hundred eleven".