1666115029 has 2 divisors, whose sum is σ = 1666115030. Its totient is φ = 1666115028.

The previous prime is 1666114999. The next prime is 1666115117. The reversal of 1666115029 is 9205116661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1616200804 + 49914225 = 40202^2 + 7065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666115029 - 2⁹ = 1666114517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666115629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833057514 + 833057515.

It is an arithmetic number, because the mean of its divisors is an integer number (833057515).

Almost surely, 2^1666115029 is an apocalyptic number.

It is an amenable number.

1666115029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666115029 is an equidigital number, since it uses as much as digits as its factorization.

1666115029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1666115029 is about 40818.0723332202. The cubic root of 1666115029 is about 1185.5002793075.

The spelling of 1666115029 in words is "one billion, six hundred sixty-six million, one hundred fifteen thousand, twenty-nine".