1329666551 has 2 divisors, whose sum is σ = 1329666552. Its totient is φ = 1329666550.

The previous prime is 1329666517. The next prime is 1329666553. The reversal of 1329666551 is 1556669231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1329666551 - 2³⁰ = 255924727 is a prime.

Together with 1329666553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329666553) 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, 664833275 + 664833276.

It is an arithmetic number, because the mean of its divisors is an integer number (664833276).

Almost surely, 2^1329666551 is an apocalyptic number.

1329666551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329666551 is an equidigital number, since it uses as much as digits as its factorization.

1329666551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 44.

The square root of 1329666551 is about 36464.5931144172. The cubic root of 1329666551 is about 1099.6325359370.

The spelling of 1329666551 in words is "one billion, three hundred twenty-nine million, six hundred sixty-six thousand, five hundred fifty-one".