199461995761 has 4 divisors (see below), whose sum is σ = 227956566592. Its totient is φ = 170967424932.

The previous prime is 199461995753. The next prime is 199461995779. The reversal of 199461995761 is 167599164991.

199461995761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167599164991 = 23 ⋅7286920217.

It is a cyclic number.

It is not a de Polignac number, because 199461995761 - 2³ = 199461995753 is a prime.

It is a super-2 number, since 2×199461995761² (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 (199461995261) 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 3 ways as a sum of consecutive naturals, for example, 14247285405 + ... + 14247285418.

It is an arithmetic number, because the mean of its divisors is an integer number (56989141648).

Almost surely, 2^199461995761 is an apocalyptic number.

It is an amenable number.

199461995761 is a deficient number, since it is larger than the sum of its proper divisors (28494570831).

199461995761 is an equidigital number, since it uses as much as digits as its factorization.

199461995761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28494570830.

The product of its digits is 33067440, while the sum is 67.

The spelling of 199461995761 in words is "one hundred ninety-nine billion, four hundred sixty-one million, nine hundred ninety-five thousand, seven hundred sixty-one".