1660121159 has 2 divisors, whose sum is σ = 1660121160. Its totient is φ = 1660121158.

The previous prime is 1660121149. The next prime is 1660121237. The reversal of 1660121159 is 9511210661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660121159 - 2²⁸ = 1391685703 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660121129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830060579 + 830060580.

It is an arithmetic number, because the mean of its divisors is an integer number (830060580).

Almost surely, 2^1660121159 is an apocalyptic number.

1660121159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660121159 is an equidigital number, since it uses as much as digits as its factorization.

1660121159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1660121159 is about 40744.5844131462. The cubic root of 1660121159 is about 1184.0769536874.

The spelling of 1660121159 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, one hundred fifty-nine".