1661417198 has 8 divisors (see below), whose sum is σ = 2848143792. Its totient is φ = 712035936.

The previous prime is 1661417183. The next prime is 1661417227. The reversal of 1661417198 is 8917141661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 59336315 + ... + 59336342.

It is an arithmetic number, because the mean of its divisors is an integer number (356017974).

Almost surely, 2^1661417198 is an apocalyptic number.

1661417198 is a deficient number, since it is larger than the sum of its proper divisors (1186726594).

1661417198 is a wasteful number, since it uses less digits than its factorization.

1661417198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118672666.

The product of its digits is 72576, while the sum is 44.

The square root of 1661417198 is about 40760.4857429349. The cubic root of 1661417198 is about 1184.3850056478.

The spelling of 1661417198 in words is "one billion, six hundred sixty-one million, four hundred seventeen thousand, one hundred ninety-eight".