664042553 has 2 divisors, whose sum is σ = 664042554. Its totient is φ = 664042552.

The previous prime is 664042543. The next prime is 664042567. The reversal of 664042553 is 355240466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529552144 + 134490409 = 23012^2 + 11597^2 .

It is a cyclic number.

It is not a de Polignac number, because 664042553 - 2¹⁰ = 664041529 is a prime.

It is not a weakly prime, because it can be changed into another prime (664042543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332021276 + 332021277.

It is an arithmetic number, because the mean of its divisors is an integer number (332021277).

Almost surely, 2^664042553 is an apocalyptic number.

It is an amenable number.

664042553 is a deficient number, since it is larger than the sum of its proper divisors (1).

664042553 is an equidigital number, since it uses as much as digits as its factorization.

664042553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 664042553 is about 25769.0231285550. The cubic root of 664042553 is about 872.4327703581.

The spelling of 664042553 in words is "six hundred sixty-four million, forty-two thousand, five hundred fifty-three".