64667693 has 2 divisors, whose sum is σ = 64667694. Its totient is φ = 64667692.

The previous prime is 64667689. The next prime is 64667719. The reversal of 64667693 is 39676646.

64667693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33953929 + 30713764 = 5827^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 64667693 - 2² = 64667689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64667653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333846 + 32333847.

It is an arithmetic number, because the mean of its divisors is an integer number (32333847).

Almost surely, 2^64667693 is an apocalyptic number.

It is an amenable number.

64667693 is a deficient number, since it is larger than the sum of its proper divisors (1).

64667693 is an equidigital number, since it uses as much as digits as its factorization.

64667693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 47.

The square root of 64667693 is about 8041.6225352848. The cubic root of 64667693 is about 401.3862175362.

The spelling of 64667693 in words is "sixty-four million, six hundred sixty-seven thousand, six hundred ninety-three".