664561133 has 2 divisors, whose sum is σ = 664561134. Its totient is φ = 664561132.

The previous prime is 664561111. The next prime is 664561151. The reversal of 664561133 is 331165466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579220489 + 85340644 = 24067^2 + 9238^2 .

It is a cyclic number.

It is not a de Polignac number, because 664561133 - 2⁶ = 664561069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664561093 and 664561102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664564133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332280566 + 332280567.

It is an arithmetic number, because the mean of its divisors is an integer number (332280567).

Almost surely, 2^664561133 is an apocalyptic number.

It is an amenable number.

664561133 is a deficient number, since it is larger than the sum of its proper divisors (1).

664561133 is an equidigital number, since it uses as much as digits as its factorization.

664561133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 664561133 is about 25779.0832459186. The cubic root of 664561133 is about 872.6598182894.

The spelling of 664561133 in words is "six hundred sixty-four million, five hundred sixty-one thousand, one hundred thirty-three".