199646415677641 has 3 divisors (see below), whose sum is σ = 199646429807271. Its totient is φ = 199646401548012.

The previous prime is 199646415677593. The next prime is 199646415677663. The reversal of 199646415677641 is 146776514646991.

The square root of 199646415677641 is 14129629.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 137321390733241 + 62325024944400 = 11718421^2 + 7894620^2 .

It is not a de Polignac number, because 199646415677641 - 2¹¹ = 199646415675593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199646425677641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7064815 + ... + 21194443.

It is an arithmetic number, because the mean of its divisors is an integer number (66548809935757).

Almost surely, 2^{199646415677641} is an apocalyptic number.

199646415677641 is the 14129629-th square number.

199646415677641 is the 7064815-th centered octagonal number.

It is an amenable number.

199646415677641 is a deficient number, since it is larger than the sum of its proper divisors (14129630).

199646415677641 is an frugal number, since it uses more digits than its factorization.

199646415677641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28259258 (or 14129629 counting only the distinct ones).

The product of its digits is 1646023680, while the sum is 76.

The spelling of 199646415677641 in words is "one hundred ninety-nine trillion, six hundred forty-six billion, four hundred fifteen million, six hundred seventy-seven thousand, six hundred forty-one".