199931666177377 has 4 divisors (see below), whose sum is σ = 206381074763776. Its totient is φ = 193482257590980.

The previous prime is 199931666177351. The next prime is 199931666177413. The reversal of 199931666177377 is 773771666139991.

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 199931666177377 - 2⁴⁷ = 59194177822049 is a prime.

It is a super-2 number, since 2×199931666177377² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199931666177377.

It is not an unprimeable number, because it can be changed into a prime (199931666177077) 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, 3224704293153 + ... + 3224704293214.

It is an arithmetic number, because the mean of its divisors is an integer number (51595268690944).

Almost surely, 2^{199931666177377} is an apocalyptic number.

It is an amenable number.

199931666177377 is a deficient number, since it is larger than the sum of its proper divisors (6449408586399).

199931666177377 is an equidigital number, since it uses as much as digits as its factorization.

199931666177377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449408586398.

The product of its digits is 3402639576, while the sum is 82.

The spelling of 199931666177377 in words is "one hundred ninety-nine trillion, nine hundred thirty-one billion, six hundred sixty-six million, one hundred seventy-seven thousand, three hundred seventy-seven".