68008206157 has 2 divisors, whose sum is σ = 68008206158. Its totient is φ = 68008206156.

The previous prime is 68008206023. The next prime is 68008206169. The reversal of 68008206157 is 75160280086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66879649321 + 1128556836 = 258611^2 + 33594^2 .

It is a cyclic number.

It is not a de Polignac number, because 68008206157 - 2¹¹ = 68008204109 is a prime.

It is a super-2 number, since 2×68008206157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68008206197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34004103078 + 34004103079.

It is an arithmetic number, because the mean of its divisors is an integer number (34004103079).

Almost surely, 2^68008206157 is an apocalyptic number.

It is an amenable number.

68008206157 is a deficient number, since it is larger than the sum of its proper divisors (1).

68008206157 is an equidigital number, since it uses as much as digits as its factorization.

68008206157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 68008206157 in words is "sixty-eight billion, eight million, two hundred six thousand, one hundred fifty-seven".