1660120019 has 2 divisors, whose sum is σ = 1660120020. Its totient is φ = 1660120018.

The previous prime is 1660119977. The next prime is 1660120039. The reversal of 1660120019 is 9100210661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9100210661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1660120019 - 2²⁴ = 1643342803 is a prime.

It is a super-2 number, since 2×1660120019² = 5511996954969120722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1660120019.

It is not a weakly prime, because it can be changed into another prime (1660120039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830060009 + 830060010.

It is an arithmetic number, because the mean of its divisors is an integer number (830060010).

Almost surely, 2^1660120019 is an apocalyptic number.

1660120019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660120019 is an equidigital number, since it uses as much as digits as its factorization.

1660120019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1660120019 is about 40744.5704235546. The cubic root of 1660120019 is about 1184.0766826533.

The spelling of 1660120019 in words is "one billion, six hundred sixty million, one hundred twenty thousand, nineteen".