64663655249 has 2 divisors, whose sum is σ = 64663655250. Its totient is φ = 64663655248.

The previous prime is 64663655239. The next prime is 64663655299. The reversal of 64663655249 is 94255636646.

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., 64106695249 + 556960000 = 253193^2 + 23600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64663655249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64663655194 and 64663655203.

It is not a weakly prime, because it can be changed into another prime (64663655219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331827624 + 32331827625.

It is an arithmetic number, because the mean of its divisors is an integer number (32331827625).

Almost surely, 2^64663655249 is an apocalyptic number.

It is an amenable number.

64663655249 is a deficient number, since it is larger than the sum of its proper divisors (1).

64663655249 is an equidigital number, since it uses as much as digits as its factorization.

64663655249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 56.

The spelling of 64663655249 in words is "sixty-four billion, six hundred sixty-three million, six hundred fifty-five thousand, two hundred forty-nine".