64650857 has 2 divisors, whose sum is σ = 64650858. Its totient is φ = 64650856.

The previous prime is 64650829. The next prime is 64650893. The reversal of 64650857 is 75805646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34058896 + 30591961 = 5836^2 + 5531^2 .

It is a cyclic number.

It is not a de Polignac number, because 64650857 - 2⁶ = 64650793 is a prime.

It is not a weakly prime, because it can be changed into another prime (64653857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325428 + 32325429.

It is an arithmetic number, because the mean of its divisors is an integer number (32325429).

Almost surely, 2^64650857 is an apocalyptic number.

It is an amenable number.

64650857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64650857 is an equidigital number, since it uses as much as digits as its factorization.

64650857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 64650857 is about 8040.5756634709. The cubic root of 64650857 is about 401.3513813628.

The spelling of 64650857 in words is "sixty-four million, six hundred fifty thousand, eight hundred fifty-seven".