64126657057 has 2 divisors, whose sum is σ = 64126657058. Its totient is φ = 64126657056.

The previous prime is 64126657043. The next prime is 64126657159. The reversal of 64126657057 is 75075662146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42091035921 + 22035621136 = 205161^2 + 148444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64126657057 is a prime.

It is a super-2 number, since 2×64126657057² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64126657057.

It is not a weakly prime, because it can be changed into another prime (64126657027) 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, 32063328528 + 32063328529.

It is an arithmetic number, because the mean of its divisors is an integer number (32063328529).

Almost surely, 2^64126657057 is an apocalyptic number.

It is an amenable number.

64126657057 is a deficient number, since it is larger than the sum of its proper divisors (1).

64126657057 is an equidigital number, since it uses as much as digits as its factorization.

64126657057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 64126657057 in words is "sixty-four billion, one hundred twenty-six million, six hundred fifty-seven thousand, fifty-seven".