68393557 has 2 divisors, whose sum is σ = 68393558. Its totient is φ = 68393556.

The previous prime is 68393531. The next prime is 68393561. The reversal of 68393557 is 75539386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 2686321 = 8106^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 68393557 - 2¹¹ = 68391509 is a prime.

It is a super-2 number, since 2×68393557² = 9355357278224498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68393527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34196778 + 34196779.

It is an arithmetic number, because the mean of its divisors is an integer number (34196779).

Almost surely, 2^68393557 is an apocalyptic number.

It is an amenable number.

68393557 is a deficient number, since it is larger than the sum of its proper divisors (1).

68393557 is an equidigital number, since it uses as much as digits as its factorization.

68393557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 46.

The square root of 68393557 is about 8270.0397217909. The cubic root of 68393557 is about 408.9514292428.

The spelling of 68393557 in words is "sixty-eight million, three hundred ninety-three thousand, five hundred fifty-seven".