64663553 has 2 divisors, whose sum is σ = 64663554. Its totient is φ = 64663552.

The previous prime is 64663549. The next prime is 64663559. The reversal of 64663553 is 35536646.

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., 61340224 + 3323329 = 7832^2 + 1823^2 .

It is a cyclic number.

It is not a de Polignac number, because 64663553 - 2² = 64663549 is a prime.

It is not a weakly prime, because it can be changed into another prime (64663559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331776 + 32331777.

It is an arithmetic number, because the mean of its divisors is an integer number (32331777).

Almost surely, 2^64663553 is an apocalyptic number.

It is an amenable number.

64663553 is a deficient number, since it is larger than the sum of its proper divisors (1).

64663553 is an equidigital number, since it uses as much as digits as its factorization.

64663553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 38.

The square root of 64663553 is about 8041.3651204258. The cubic root of 64663553 is about 401.3776518247.

The spelling of 64663553 in words is "sixty-four million, six hundred sixty-three thousand, five hundred fifty-three".