664838811149 has 2 divisors, whose sum is σ = 664838811150. Its totient is φ = 664838811148.

The previous prime is 664838811079. The next prime is 664838811157. The reversal of 664838811149 is 941118838466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631269975625 + 33568835524 = 794525^2 + 183218^2 .

It is a cyclic number.

It is not a de Polignac number, because 664838811149 - 2¹² = 664838807053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664838831149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332419405574 + 332419405575.

It is an arithmetic number, because the mean of its divisors is an integer number (332419405575).

Almost surely, 2^664838811149 is an apocalyptic number.

It is an amenable number.

664838811149 is a deficient number, since it is larger than the sum of its proper divisors (1).

664838811149 is an equidigital number, since it uses as much as digits as its factorization.

664838811149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 59.

The spelling of 664838811149 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, eight hundred eleven thousand, one hundred forty-nine".