199657868757131 has 2 divisors, whose sum is σ = 199657868757132. Its totient is φ = 199657868757130.

The previous prime is 199657868756981. The next prime is 199657868757157. The reversal of 199657868757131 is 131757868756991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199657868757131 - 2²⁶ = 199657801648267 is a prime.

It is a super-4 number, since 4×199657868757131⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 199657868757131.

It is not a weakly prime, because it can be changed into another prime (199657868757631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99828934378565 + 99828934378566.

It is an arithmetic number, because the mean of its divisors is an integer number (99828934378566).

Almost surely, 2^{199657868757131} is an apocalyptic number.

199657868757131 is a deficient number, since it is larger than the sum of its proper divisors (1).

199657868757131 is an equidigital number, since it uses as much as digits as its factorization.

199657868757131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800902400, while the sum is 83.

The spelling of 199657868757131 in words is "one hundred ninety-nine trillion, six hundred fifty-seven billion, eight hundred sixty-eight million, seven hundred fifty-seven thousand, one hundred thirty-one".