1998676667 has 4 divisors (see below), whose sum is σ = 2152421040. Its totient is φ = 1844932296.

The previous prime is 1998676663. The next prime is 1998676727. The reversal of 1998676667 is 7666768991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1998676667 - 2² = 1998676663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998676663) by changing a digit.

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, 76872167 + ... + 76872192.

It is an arithmetic number, because the mean of its divisors is an integer number (538105260).

Almost surely, 2^1998676667 is an apocalyptic number.

1998676667 is a deficient number, since it is larger than the sum of its proper divisors (153744373).

1998676667 is a wasteful number, since it uses less digits than its factorization.

1998676667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153744372.

The product of its digits is 41150592, while the sum is 65.

The square root of 1998676667 is about 44706.5617890707. The cubic root of 1998676667 is about 1259.6431060667.

The spelling of 1998676667 in words is "one billion, nine hundred ninety-eight million, six hundred seventy-six thousand, six hundred sixty-seven".