199625771897 has 2 divisors, whose sum is σ = 199625771898. Its totient is φ = 199625771896.

The previous prime is 199625771893. The next prime is 199625771909. The reversal of 199625771897 is 798177526991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172736659456 + 26889112441 = 415616^2 + 163979^2 .

It is a cyclic number.

It is not a de Polignac number, because 199625771897 - 2² = 199625771893 is a prime.

It is a super-3 number, since 3×199625771897³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199625771897.

It is not a weakly prime, because it can be changed into another prime (199625771893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99812885948 + 99812885949.

It is an arithmetic number, because the mean of its divisors is an integer number (99812885949).

Almost surely, 2^199625771897 is an apocalyptic number.

It is an amenable number.

199625771897 is a deficient number, since it is larger than the sum of its proper divisors (1).

199625771897 is an equidigital number, since it uses as much as digits as its factorization.

199625771897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120022560, while the sum is 71.

The spelling of 199625771897 in words is "one hundred ninety-nine billion, six hundred twenty-five million, seven hundred seventy-one thousand, eight hundred ninety-seven".