199718012049 has 4 divisors (see below), whose sum is σ = 266290682736. Its totient is φ = 133145341364.

The previous prime is 199718011957. The next prime is 199718012051. The reversal of 199718012049 is 940210817991.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 199718012049 - 2⁸ = 199718011793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199718011992 and 199718012010.

It is not an unprimeable number, because it can be changed into a prime (199718012059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33286335339 + ... + 33286335344.

It is an arithmetic number, because the mean of its divisors is an integer number (66572670684).

Almost surely, 2^199718012049 is an apocalyptic number.

It is an amenable number.

199718012049 is a deficient number, since it is larger than the sum of its proper divisors (66572670687).

199718012049 is an equidigital number, since it uses as much as digits as its factorization.

199718012049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66572670686.

The product of its (nonzero) digits is 326592, while the sum is 51.

The spelling of 199718012049 in words is "one hundred ninety-nine billion, seven hundred eighteen million, twelve thousand, forty-nine".