664004626249 has 2 divisors, whose sum is σ = 664004626250. Its totient is φ = 664004626248.

The previous prime is 664004626231. The next prime is 664004626253. The reversal of 664004626249 is 942626400466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422032129600 + 241972496649 = 649640^2 + 491907^2 .

It is a cyclic number.

It is not a de Polignac number, because 664004626249 - 2⁹ = 664004625737 is a prime.

It is not a weakly prime, because it can be changed into another prime (664004626049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332002313124 + 332002313125.

It is an arithmetic number, because the mean of its divisors is an integer number (332002313125).

Almost surely, 2^664004626249 is an apocalyptic number.

It is an amenable number.

664004626249 is a deficient number, since it is larger than the sum of its proper divisors (1).

664004626249 is an equidigital number, since it uses as much as digits as its factorization.

664004626249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 664004626249 in words is "six hundred sixty-four billion, four million, six hundred twenty-six thousand, two hundred forty-nine".