1660718459 has 2 divisors, whose sum is σ = 1660718460. Its totient is φ = 1660718458.

The previous prime is 1660718419. The next prime is 1660718461. The reversal of 1660718459 is 9548170661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9548170661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660718459 is a prime.

Together with 1660718461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1660718419) 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, 830359229 + 830359230.

It is an arithmetic number, because the mean of its divisors is an integer number (830359230).

Almost surely, 2^1660718459 is an apocalyptic number.

1660718459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660718459 is an equidigital number, since it uses as much as digits as its factorization.

1660718459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1660718459 is about 40751.9135624329. The cubic root of 1660718459 is about 1184.2189441994.

The spelling of 1660718459 in words is "one billion, six hundred sixty million, seven hundred eighteen thousand, four hundred fifty-nine".