65671553 has 2 divisors, whose sum is σ = 65671554. Its totient is φ = 65671552.

The previous prime is 65671537. The next prime is 65671577. The reversal of 65671553 is 35517656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55830784 + 9840769 = 7472^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 65671553 - 2⁴ = 65671537 is a prime.

It is not a weakly prime, because it can be changed into another prime (65671583) 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, 32835776 + 32835777.

It is an arithmetic number, because the mean of its divisors is an integer number (32835777).

Almost surely, 2^65671553 is an apocalyptic number.

It is an amenable number.

65671553 is a deficient number, since it is larger than the sum of its proper divisors (1).

65671553 is an equidigital number, since it uses as much as digits as its factorization.

65671553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 38.

The square root of 65671553 is about 8103.7986771637. The cubic root of 65671553 is about 403.4525166684.

The spelling of 65671553 in words is "sixty-five million, six hundred seventy-one thousand, five hundred fifty-three".