64556213 has 2 divisors, whose sum is σ = 64556214. Its totient is φ = 64556212.

The previous prime is 64556209. The next prime is 64556237. The reversal of 64556213 is 31265546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59089969 + 5466244 = 7687^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 64556213 - 2² = 64556209 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64556213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64556273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32278106 + 32278107.

It is an arithmetic number, because the mean of its divisors is an integer number (32278107).

Almost surely, 2^64556213 is an apocalyptic number.

It is an amenable number.

64556213 is a deficient number, since it is larger than the sum of its proper divisors (1).

64556213 is an equidigital number, since it uses as much as digits as its factorization.

64556213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 64556213 is about 8034.6881084458. The cubic root of 64556213 is about 401.1554362872.

The spelling of 64556213 in words is "sixty-four million, five hundred fifty-six thousand, two hundred thirteen".