199107889450 has 12 divisors (see below), whose sum is σ = 370340674470. Its totient is φ = 79643155760.

The previous prime is 199107889429. The next prime is 199107889451. The reversal of 199107889450 is 54988701991.

It can be written as a sum of positive squares in 3 ways, for example, as 108164027689 + 90943861761 = 328883^2 + 301569^2 .

It is not an unprimeable number, because it can be changed into a prime (199107889451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1991078845 + ... + 1991078944.

Almost surely, 2^199107889450 is an apocalyptic number.

199107889450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199107889450 is a deficient number, since it is larger than the sum of its proper divisors (171232785020).

199107889450 is a wasteful number, since it uses less digits than its factorization.

199107889450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982157801 (or 3982157796 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 61.

The spelling of 199107889450 in words is "one hundred ninety-nine billion, one hundred seven million, eight hundred eighty-nine thousand, four hundred fifty".