65005553 has 2 divisors, whose sum is σ = 65005554. Its totient is φ = 65005552.

The previous prime is 65005547. The next prime is 65005579. The reversal of 65005553 is 35550056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56670784 + 8334769 = 7528^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 65005553 - 2⁶ = 65005489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65005453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32502776 + 32502777.

It is an arithmetic number, because the mean of its divisors is an integer number (32502777).

Almost surely, 2^65005553 is an apocalyptic number.

It is an amenable number.

65005553 is a deficient number, since it is larger than the sum of its proper divisors (1).

65005553 is an equidigital number, since it uses as much as digits as its factorization.

65005553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 29.

The square root of 65005553 is about 8062.6021233842. The cubic root of 65005553 is about 402.0840253227.

The spelling of 65005553 in words is "sixty-five million, five thousand, five hundred fifty-three".