199969689677 has 4 divisors (see below), whose sum is σ = 199978374336. Its totient is φ = 199961005020.

The previous prime is 199969689653. The next prime is 199969689697. The reversal of 199969689677 is 776986969991.

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 a de Polignac number, because none of the positive numbers 2^k-199969689677 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 (199969689637) 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, 4307699 + ... + 4353872.

It is an arithmetic number, because the mean of its divisors is an integer number (49994593584).

Almost surely, 2^199969689677 is an apocalyptic number.

It is an amenable number.

199969689677 is a deficient number, since it is larger than the sum of its proper divisors (8684659).

199969689677 is an equidigital number, since it uses as much as digits as its factorization.

199969689677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684658.

The product of its digits is 4999796928, while the sum is 86.

The spelling of 199969689677 in words is "one hundred ninety-nine billion, nine hundred sixty-nine million, six hundred eighty-nine thousand, six hundred seventy-seven".