198405682805 has 16 divisors (see below), whose sum is σ = 271023732864. Its totient is φ = 138021343680.

The previous prime is 198405682799. The next prime is 198405682819. The reversal of 198405682805 is 508286504891.

It is not a de Polignac number, because 198405682805 - 2¹⁴ = 198405666421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78419954 + ... + 78422483.

It is an arithmetic number, because the mean of its divisors is an integer number (16938983304).

Almost surely, 2^198405682805 is an apocalyptic number.

It is an amenable number.

198405682805 is a deficient number, since it is larger than the sum of its proper divisors (72618050059).

198405682805 is a wasteful number, since it uses less digits than its factorization.

198405682805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156842476.

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 198405682805 in words is "one hundred ninety-eight billion, four hundred five million, six hundred eighty-two thousand, eight hundred five".