64668841 has 2 divisors, whose sum is σ = 64668842. Its totient is φ = 64668840.

The previous prime is 64668839. The next prime is 64668853. The reversal of 64668841 is 14886646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33977241 + 30691600 = 5829^2 + 5540^2 .

It is a cyclic number.

It is not a de Polignac number, because 64668841 - 2¹ = 64668839 is a prime.

Together with 64668839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64668641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32334420 + 32334421.

It is an arithmetic number, because the mean of its divisors is an integer number (32334421).

Almost surely, 2^64668841 is an apocalyptic number.

It is an amenable number.

64668841 is a deficient number, since it is larger than the sum of its proper divisors (1).

64668841 is an equidigital number, since it uses as much as digits as its factorization.

64668841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 43.

The square root of 64668841 is about 8041.6939135981. The cubic root of 64668841 is about 401.3885926977.

The spelling of 64668841 in words is "sixty-four million, six hundred sixty-eight thousand, eight hundred forty-one".