64257355649 has 2 divisors, whose sum is σ = 64257355650. Its totient is φ = 64257355648.

The previous prime is 64257355583. The next prime is 64257355697. The reversal of 64257355649 is 94655375246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42707115649 + 21550240000 = 206657^2 + 146800^2 .

It is a cyclic number.

It is not a de Polignac number, because 64257355649 - 2²⁴ = 64240578433 is a prime.

It is a super-2 number, since 2×64257355649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64257355594 and 64257355603.

It is not a weakly prime, because it can be changed into another prime (64257355699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32128677824 + 32128677825.

It is an arithmetic number, because the mean of its divisors is an integer number (32128677825).

Almost surely, 2^64257355649 is an apocalyptic number.

It is an amenable number.

64257355649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64257355649 is an equidigital number, since it uses as much as digits as its factorization.

64257355649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216000, while the sum is 56.

The spelling of 64257355649 in words is "sixty-four billion, two hundred fifty-seven million, three hundred fifty-five thousand, six hundred forty-nine".