1660882991 has 2 divisors, whose sum is σ = 1660882992. Its totient is φ = 1660882990.

The previous prime is 1660882987. The next prime is 1660883011. The reversal of 1660882991 is 1992880661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1992880661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1660882991 - 2² = 1660882987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660882901) 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, 830441495 + 830441496.

It is an arithmetic number, because the mean of its divisors is an integer number (830441496).

Almost surely, 2^1660882991 is an apocalyptic number.

1660882991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660882991 is an equidigital number, since it uses as much as digits as its factorization.

1660882991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1660882991 is about 40753.9322151863. The cubic root of 1660882991 is about 1184.2580508636.

It can be divided in two parts, 16608 and 82991, that added together give a palindrome (99599).

The spelling of 1660882991 in words is "one billion, six hundred sixty million, eight hundred eighty-two thousand, nine hundred ninety-one".