64636306253 has 2 divisors, whose sum is σ = 64636306254. Its totient is φ = 64636306252.

The previous prime is 64636306243. The next prime is 64636306307. The reversal of 64636306253 is 35260363646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63909356809 + 726949444 = 252803^2 + 26962^2 .

It is a cyclic number.

It is not a de Polignac number, because 64636306253 - 2¹⁰ = 64636305229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64636306223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318153126 + 32318153127.

It is an arithmetic number, because the mean of its divisors is an integer number (32318153127).

Almost surely, 2^64636306253 is an apocalyptic number.

It is an amenable number.

64636306253 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636306253 is an equidigital number, since it uses as much as digits as its factorization.

64636306253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 44.

Adding to 64636306253 its reverse (35260363646), we get a palindrome (99896669899).

The spelling of 64636306253 in words is "sixty-four billion, six hundred thirty-six million, three hundred six thousand, two hundred fifty-three".