64816693 has 2 divisors, whose sum is σ = 64816694. Its totient is φ = 64816692.

The previous prime is 64816667. The next prime is 64816727. The reversal of 64816693 is 39661846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63393444 + 1423249 = 7962^2 + 1193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64816693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64816793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32408346 + 32408347.

It is an arithmetic number, because the mean of its divisors is an integer number (32408347).

Almost surely, 2^64816693 is an apocalyptic number.

It is an amenable number.

64816693 is a deficient number, since it is larger than the sum of its proper divisors (1).

64816693 is an equidigital number, since it uses as much as digits as its factorization.

64816693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 64816693 is about 8050.8815045310. The cubic root of 64816693 is about 401.6942573481.

The spelling of 64816693 in words is "sixty-four million, eight hundred sixteen thousand, six hundred ninety-three".