199857766557 has 16 divisors (see below), whose sum is σ = 267254488832. Its totient is φ = 132849918720.

The previous prime is 199857766541. The next prime is 199857766573. The reversal of 199857766557 is 755667758991.

It is an interprime number because it is at equal distance from previous prime (199857766541) and next prime (199857766573).

It is not a de Polignac number, because 199857766557 - 2⁴ = 199857766541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199857766957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6989193 + ... + 7017729.

It is an arithmetic number, because the mean of its divisors is an integer number (16703405552).

Almost surely, 2^199857766557 is an apocalyptic number.

It is an amenable number.

199857766557 is a deficient number, since it is larger than the sum of its proper divisors (67396722275).

199857766557 is a wasteful number, since it uses less digits than its factorization.

199857766557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35268.

The product of its digits is 1000188000, while the sum is 75.

The spelling of 199857766557 in words is "one hundred ninety-nine billion, eight hundred fifty-seven million, seven hundred sixty-six thousand, five hundred fifty-seven".