68557897 has 2 divisors, whose sum is σ = 68557898. Its totient is φ = 68557896.

The previous prime is 68557861. The next prime is 68557901. The reversal of 68557897 is 79875586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67059721 + 1498176 = 8189^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 68557897 - 2¹⁵ = 68525129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68557397) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34278948 + 34278949.

It is an arithmetic number, because the mean of its divisors is an integer number (34278949).

Almost surely, 2^68557897 is an apocalyptic number.

It is an amenable number.

68557897 is a deficient number, since it is larger than the sum of its proper divisors (1).

68557897 is an equidigital number, since it uses as much as digits as its factorization.

68557897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 55.

The square root of 68557897 is about 8279.9696255482. The cubic root of 68557897 is about 409.2787179665.

The spelling of 68557897 in words is "sixty-eight million, five hundred fifty-seven thousand, eight hundred ninety-seven".