64663655449 has 2 divisors, whose sum is σ = 64663655450. Its totient is φ = 64663655448.

The previous prime is 64663655437. The next prime is 64663655533. The reversal of 64663655449 is 94455636646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49209436224 + 15454219225 = 221832^2 + 124315^2 .

It is a cyclic number.

It is not a de Polignac number, because 64663655449 - 2⁷ = 64663655321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64663655393 and 64663655402.

It is not a weakly prime, because it can be changed into another prime (64663655249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331827724 + 32331827725.

It is an arithmetic number, because the mean of its divisors is an integer number (32331827725).

Almost surely, 2^64663655449 is an apocalyptic number.

It is an amenable number.

64663655449 is a deficient number, since it is larger than the sum of its proper divisors (1).

64663655449 is an equidigital number, since it uses as much as digits as its factorization.

64663655449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55987200, while the sum is 58.

The spelling of 64663655449 in words is "sixty-four billion, six hundred sixty-three million, six hundred fifty-five thousand, four hundred forty-nine".