64885771693 has 2 divisors, whose sum is σ = 64885771694. Its totient is φ = 64885771692.

The previous prime is 64885771669. The next prime is 64885771703. The reversal of 64885771693 is 39617758846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64271376324 + 614395369 = 253518^2 + 24787^2 .

It is a cyclic number.

It is not a de Polignac number, because 64885771693 - 2¹⁷ = 64885640621 is a prime.

It is a super-2 number, since 2×64885771693² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64885771193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32442885846 + 32442885847.

It is an arithmetic number, because the mean of its divisors is an integer number (32442885847).

Almost surely, 2^64885771693 is an apocalyptic number.

It is an amenable number.

64885771693 is a deficient number, since it is larger than the sum of its proper divisors (1).

64885771693 is an equidigital number, since it uses as much as digits as its factorization.

64885771693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 64.

The spelling of 64885771693 in words is "sixty-four billion, eight hundred eighty-five million, seven hundred seventy-one thousand, six hundred ninety-three".