64426061257 has 2 divisors, whose sum is σ = 64426061258. Its totient is φ = 64426061256.

The previous prime is 64426061243. The next prime is 64426061269. The reversal of 64426061257 is 75216062446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51041653776 + 13384407481 = 225924^2 + 115691^2 .

It is a cyclic number.

It is not a de Polignac number, because 64426061257 - 2³⁵ = 30066322889 is a prime.

It is not a weakly prime, because it can be changed into another prime (64426061857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32213030628 + 32213030629.

It is an arithmetic number, because the mean of its divisors is an integer number (32213030629).

Almost surely, 2^64426061257 is an apocalyptic number.

It is an amenable number.

64426061257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64426061257 is an equidigital number, since it uses as much as digits as its factorization.

64426061257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 64426061257 in words is "sixty-four billion, four hundred twenty-six million, sixty-one thousand, two hundred fifty-seven".