68564257 has 2 divisors, whose sum is σ = 68564258. Its totient is φ = 68564256.

The previous prime is 68564233. The next prime is 68564263. The reversal of 68564257 is 75246586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 11350161 = 7564^2 + 3369^2 .

It is a cyclic number.

It is not a de Polignac number, because 68564257 - 2⁷ = 68564129 is a prime.

It is not a weakly prime, because it can be changed into another prime (68564857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34282128 + 34282129.

It is an arithmetic number, because the mean of its divisors is an integer number (34282129).

Almost surely, 2^68564257 is an apocalyptic number.

It is an amenable number.

68564257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68564257 is an equidigital number, since it uses as much as digits as its factorization.

68564257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 43.

The square root of 68564257 is about 8280.3536760213. The cubic root of 68564257 is about 409.2913736063.

The spelling of 68564257 in words is "sixty-eight million, five hundred sixty-four thousand, two hundred fifty-seven".