199857528613 has 2 divisors, whose sum is σ = 199857528614. Its totient is φ = 199857528612.

The previous prime is 199857528571. The next prime is 199857528623. The reversal of 199857528613 is 316825758991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183554835489 + 16302693124 = 428433^2 + 127682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199857528613 is a prime.

It is a super-2 number, since 2×199857528613² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199857528623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99928764306 + 99928764307.

It is an arithmetic number, because the mean of its divisors is an integer number (99928764307).

Almost surely, 2^199857528613 is an apocalyptic number.

It is an amenable number.

199857528613 is a deficient number, since it is larger than the sum of its proper divisors (1).

199857528613 is an equidigital number, since it uses as much as digits as its factorization.

199857528613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 64.

The spelling of 199857528613 in words is "one hundred ninety-nine billion, eight hundred fifty-seven million, five hundred twenty-eight thousand, six hundred thirteen".