199657661331 has 8 divisors (see below), whose sum is σ = 266213746624. Its totient is φ = 133103341800.

The previous prime is 199657661317. The next prime is 199657661339. The reversal of 199657661331 is 133166756991.

It is a happy number.

199657661331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199657661331 - 2⁵ = 199657661299 is a prime.

It is a super-2 number, since 2×199657661331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199657661339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150145 + ... + 649506.

It is an arithmetic number, because the mean of its divisors is an integer number (33276718328).

Almost surely, 2^199657661331 is an apocalyptic number.

199657661331 is a deficient number, since it is larger than the sum of its proper divisors (66556085293).

199657661331 is an equidigital number, since it uses as much as digits as its factorization.

199657661331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882881.

The product of its digits is 5511240, while the sum is 57.

The spelling of 199657661331 in words is "one hundred ninety-nine billion, six hundred fifty-seven million, six hundred sixty-one thousand, three hundred thirty-one".