664801623319 has 2 divisors, whose sum is σ = 664801623320. Its totient is φ = 664801623318.

The previous prime is 664801623313. The next prime is 664801623371. The reversal of 664801623319 is 913326108466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664801623319 - 2³¹ = 662654139671 is a prime.

It is a super-2 number, since 2×664801623319² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664801623313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332400811659 + 332400811660.

It is an arithmetic number, because the mean of its divisors is an integer number (332400811660).

Almost surely, 2^664801623319 is an apocalyptic number.

664801623319 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801623319 is an equidigital number, since it uses as much as digits as its factorization.

664801623319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 664801623319 in words is "six hundred sixty-four billion, eight hundred one million, six hundred twenty-three thousand, three hundred nineteen".