199122686626 has 4 divisors (see below), whose sum is σ = 298684029942. Its totient is φ = 99561343312.

The previous prime is 199122686603. The next prime is 199122686681. The reversal of 199122686626 is 626686221991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 626686221991 = 73 ⋅8584742767.

It can be written as a sum of positive squares in only one way, i.e., 132455963025 + 66666723601 = 363945^2 + 258199^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49780671655 + ... + 49780671658.

Almost surely, 2^199122686626 is an apocalyptic number.

199122686626 is a deficient number, since it is larger than the sum of its proper divisors (99561343316).

199122686626 is an equidigital number, since it uses as much as digits as its factorization.

199122686626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99561343315.

The product of its digits is 6718464, while the sum is 58.

The spelling of 199122686626 in words is "one hundred ninety-nine billion, one hundred twenty-two million, six hundred eighty-six thousand, six hundred twenty-six".