664148213 has 2 divisors, whose sum is σ = 664148214. Its totient is φ = 664148212.

The previous prime is 664148179. The next prime is 664148239. The reversal of 664148213 is 312841466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650913169 + 13235044 = 25513^2 + 3638^2 .

It is a cyclic number.

It is not a de Polignac number, because 664148213 - 2¹⁰ = 664147189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664148263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332074106 + 332074107.

It is an arithmetic number, because the mean of its divisors is an integer number (332074107).

Almost surely, 2^664148213 is an apocalyptic number.

It is an amenable number.

664148213 is a deficient number, since it is larger than the sum of its proper divisors (1).

664148213 is an equidigital number, since it uses as much as digits as its factorization.

664148213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 664148213 is about 25771.0731829313. The cubic root of 664148213 is about 872.4790406648.

Adding to 664148213 its reverse (312841466), we get a palindrome (976989679).

It can be divided in two parts, 664 and 148213, that added together give a cube (148877 = 53³).

The spelling of 664148213 in words is "six hundred sixty-four million, one hundred forty-eight thousand, two hundred thirteen".