1660121198 has 4 divisors (see below), whose sum is σ = 2490181800. Its totient is φ = 830060598.

The previous prime is 1660121159. The next prime is 1660121237. The reversal of 1660121198 is 8911210661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1660121159) and next prime (1660121237).

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 as a sum of consecutive naturals, namely, 415030298 + ... + 415030301.

It is an arithmetic number, because the mean of its divisors is an integer number (622545450).

Almost surely, 2^1660121198 is an apocalyptic number.

1660121198 is a deficient number, since it is larger than the sum of its proper divisors (830060602).

1660121198 is an equidigital number, since it uses as much as digits as its factorization.

1660121198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830060601.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1660121198 is about 40744.5848917375. The cubic root of 1660121198 is about 1184.0769629596.

The spelling of 1660121198 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, one hundred ninety-eight".