664650553 has 6 divisors (see below), whose sum is σ = 773164986. Its totient is φ = 569700432.

The previous prime is 664650541. The next prime is 664650583. The reversal of 664650553 is 355056466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 587965504 + 76685049 = 24248^2 + 8757^2 .

It is not a de Polignac number, because 664650553 - 2⁵ = 664650521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664650523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6782100 + ... + 6782197.

It is an arithmetic number, because the mean of its divisors is an integer number (128860831).

Almost surely, 2^664650553 is an apocalyptic number.

It is an amenable number.

664650553 is a deficient number, since it is larger than the sum of its proper divisors (108514433).

664650553 is a wasteful number, since it uses less digits than its factorization.

664650553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13564311 (or 13564304 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 664650553 is about 25780.8175394032. The cubic root of 664650553 is about 872.6989567711.

The spelling of 664650553 in words is "six hundred sixty-four million, six hundred fifty thousand, five hundred fifty-three".