1984166721903 has 8 divisors (see below), whose sum is σ = 2717057132848. Its totient is φ = 1287027062784.

The previous prime is 1984166721877. The next prime is 1984166721917. The reversal of 1984166721903 is 3091276614891.

It is a happy number.

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

It is not a de Polignac number, because 1984166721903 - 2⁵ = 1984166721871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1984166721923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8937687826 + ... + 8937688047.

It is an arithmetic number, because the mean of its divisors is an integer number (339632141606).

Almost surely, 2^{1984166721903} is an apocalyptic number.

1984166721903 is a deficient number, since it is larger than the sum of its proper divisors (732890410945).

1984166721903 is a wasteful number, since it uses less digits than its factorization.

1984166721903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17875375913.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 1984166721903 in words is "one trillion, nine hundred eighty-four billion, one hundred sixty-six million, seven hundred twenty-one thousand, nine hundred three".