664557650699 has 2 divisors, whose sum is σ = 664557650700. Its totient is φ = 664557650698.

The previous prime is 664557650671. The next prime is 664557650717. The reversal of 664557650699 is 996056755466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664557650699 - 2⁸ = 664557650443 is a prime.

It is a super-2 number, since 2×664557650699² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664557650609) 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, 332278825349 + 332278825350.

It is an arithmetic number, because the mean of its divisors is an integer number (332278825350).

Almost surely, 2^664557650699 is an apocalyptic number.

664557650699 is a deficient number, since it is larger than the sum of its proper divisors (1).

664557650699 is an equidigital number, since it uses as much as digits as its factorization.

664557650699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416000, while the sum is 68.

The spelling of 664557650699 in words is "six hundred sixty-four billion, five hundred fifty-seven million, six hundred fifty thousand, six hundred ninety-nine".