1006111661 has 2 divisors, whose sum is σ = 1006111662. Its totient is φ = 1006111660.

The previous prime is 1006111651. The next prime is 1006111679. The reversal of 1006111661 is 1661116001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532178761 + 473932900 = 23069^2 + 21770^2 .

It is an emirp because it is prime and its reverse (1661116001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1006111661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1006111621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503055830 + 503055831.

It is an arithmetic number, because the mean of its divisors is an integer number (503055831).

Almost surely, 2^1006111661 is an apocalyptic number.

It is an amenable number.

1006111661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006111661 is an equidigital number, since it uses as much as digits as its factorization.

1006111661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1006111661 is about 31719.2632480643. The cubic root of 1006111661 is about 1002.0330841012.

Adding to 1006111661 its reverse (1661116001), we get a palindrome (2667227662).

The spelling of 1006111661 in words is "one billion, six million, one hundred eleven thousand, six hundred sixty-one".