664628761732651 has 2 divisors, whose sum is σ = 664628761732652. Its totient is φ = 664628761732650.

The previous prime is 664628761732601. The next prime is 664628761732673. The reversal of 664628761732651 is 156237167826466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664628761732651 - 2¹⁵ = 664628761699883 is a prime.

It is not a weakly prime, because it can be changed into another prime (664628761732601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332314380866325 + 332314380866326.

It is an arithmetic number, because the mean of its divisors is an integer number (332314380866326).

Almost surely, 2^{664628761732651} is an apocalyptic number.

664628761732651 is a deficient number, since it is larger than the sum of its proper divisors (1).

664628761732651 is an equidigital number, since it uses as much as digits as its factorization.

664628761732651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 731566080, while the sum is 70.

The spelling of 664628761732651 in words is "six hundred sixty-four trillion, six hundred twenty-eight billion, seven hundred sixty-one million, seven hundred thirty-two thousand, six hundred fifty-one".