64770647657 has 2 divisors, whose sum is σ = 64770647658. Its totient is φ = 64770647656.

The previous prime is 64770647629. The next prime is 64770647687. The reversal of 64770647657 is 75674607746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57188417881 + 7582229776 = 239141^2 + 87076^2 .

It is a cyclic number.

It is not a de Polignac number, because 64770647657 - 2⁶ = 64770647593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64770647596 and 64770647605.

It is not a weakly prime, because it can be changed into another prime (64770647687) 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, 32385323828 + 32385323829.

It is an arithmetic number, because the mean of its divisors is an integer number (32385323829).

Almost surely, 2^64770647657 is an apocalyptic number.

It is an amenable number.

64770647657 is a deficient number, since it is larger than the sum of its proper divisors (1).

64770647657 is an equidigital number, since it uses as much as digits as its factorization.

64770647657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41489280, while the sum is 59.

The spelling of 64770647657 in words is "sixty-four billion, seven hundred seventy million, six hundred forty-seven thousand, six hundred fifty-seven".