64747229257 has 2 divisors, whose sum is σ = 64747229258. Its totient is φ = 64747229256.

The previous prime is 64747229249. The next prime is 64747229341. The reversal of 64747229257 is 75292274746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57722945536 + 7024283721 = 240256^2 + 83811^2 .

It is a cyclic number.

It is not a de Polignac number, because 64747229257 - 2³ = 64747229249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64747229198 and 64747229207.

It is not a weakly prime, because it can be changed into another prime (64747229237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32373614628 + 32373614629.

It is an arithmetic number, because the mean of its divisors is an integer number (32373614629).

Almost surely, 2^64747229257 is an apocalyptic number.

It is an amenable number.

64747229257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64747229257 is an equidigital number, since it uses as much as digits as its factorization.

64747229257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 55.

The spelling of 64747229257 in words is "sixty-four billion, seven hundred forty-seven million, two hundred twenty-nine thousand, two hundred fifty-seven".