1661430011 has 2 divisors, whose sum is σ = 1661430012. Its totient is φ = 1661430010.

The previous prime is 1661429999. The next prime is 1661430031. The reversal of 1661430011 is 1100341661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661430011 - 2⁶ = 1661429947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661430031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830715005 + 830715006.

It is an arithmetic number, because the mean of its divisors is an integer number (830715006).

Almost surely, 2^1661430011 is an apocalyptic number.

1661430011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661430011 is an equidigital number, since it uses as much as digits as its factorization.

1661430011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1661430011 is about 40760.6429169119. The cubic root of 1661430011 is about 1184.3880503348.

Adding to 1661430011 its reverse (1100341661), we get a palindrome (2761771672).

The spelling of 1661430011 in words is "one billion, six hundred sixty-one million, four hundred thirty thousand, eleven".