1668159377 has 2 divisors, whose sum is σ = 1668159378. Its totient is φ = 1668159376.

The previous prime is 1668159347. The next prime is 1668159379. The reversal of 1668159377 is 7739518661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1583960401 + 84198976 = 39799^2 + 9176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668159377 - 2²⁸ = 1399723921 is a prime.

Together with 1668159379, 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 (1668159379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834079688 + 834079689.

It is an arithmetic number, because the mean of its divisors is an integer number (834079689).

Almost surely, 2^1668159377 is an apocalyptic number.

It is an amenable number.

1668159377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668159377 is an equidigital number, since it uses as much as digits as its factorization.

1668159377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 1668159377 is about 40843.1068480350. The cubic root of 1668159377 is about 1185.9849566364.

The spelling of 1668159377 in words is "one billion, six hundred sixty-eight million, one hundred fifty-nine thousand, three hundred seventy-seven".