199657868756959 has 2 divisors, whose sum is σ = 199657868756960. Its totient is φ = 199657868756958.

The previous prime is 199657868756933. The next prime is 199657868756981. The reversal of 199657868756959 is 959657868756991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199657868756959 - 2⁴⁵ = 164473496668127 is a prime.

It is a super-4 number, since 4×199657868756959⁴ (a number of 58 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199657868757959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99828934378479 + 99828934378480.

It is an arithmetic number, because the mean of its divisors is an integer number (99828934378480).

Almost surely, 2^{199657868756959} is an apocalyptic number.

199657868756959 is a deficient number, since it is larger than the sum of its proper divisors (1).

199657868756959 is an equidigital number, since it uses as much as digits as its factorization.

199657868756959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555532992000, while the sum is 100.

The spelling of 199657868756959 in words is "one hundred ninety-nine trillion, six hundred fifty-seven billion, eight hundred sixty-eight million, seven hundred fifty-six thousand, nine hundred fifty-nine".