64419988693 has 2 divisors, whose sum is σ = 64419988694. Its totient is φ = 64419988692.

The previous prime is 64419988691. The next prime is 64419988697. The reversal of 64419988693 is 39688991446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39347483044 + 25072505649 = 198362^2 + 158343^2 .

It is a cyclic number.

It is not a de Polignac number, because 64419988693 - 2¹ = 64419988691 is a prime.

Together with 64419988691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64419988691) 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, 32209994346 + 32209994347.

It is an arithmetic number, because the mean of its divisors is an integer number (32209994347).

Almost surely, 2^64419988693 is an apocalyptic number.

It is an amenable number.

64419988693 is a deficient number, since it is larger than the sum of its proper divisors (1).

64419988693 is an equidigital number, since it uses as much as digits as its factorization.

64419988693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80621568, while the sum is 67.

The spelling of 64419988693 in words is "sixty-four billion, four hundred nineteen million, nine hundred eighty-eight thousand, six hundred ninety-three".