664116451 has 2 divisors, whose sum is σ = 664116452. Its totient is φ = 664116450.

The previous prime is 664116413. The next prime is 664116457. The reversal of 664116451 is 154611466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664116451 - 2¹⁷ = 663985379 is a prime.

It is not a weakly prime, because it can be changed into another prime (664116457) 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, 332058225 + 332058226.

It is an arithmetic number, because the mean of its divisors is an integer number (332058226).

Almost surely, 2^664116451 is an apocalyptic number.

664116451 is a deficient number, since it is larger than the sum of its proper divisors (1).

664116451 is an equidigital number, since it uses as much as digits as its factorization.

664116451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 664116451 is about 25770.4569420102. The cubic root of 664116451 is about 872.4651320620.

The spelling of 664116451 in words is "six hundred sixty-four million, one hundred sixteen thousand, four hundred fifty-one".