1984166721904 has 40 divisors (see below), whose sum is σ = 3933653640768. Its totient is φ = 969111336960.

The previous prime is 1984166721877. The next prime is 1984166721917. The reversal of 1984166721904 is 4091276614891.

It is a happy number.

It is a super-2 number, since 2×1984166721904² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140377 + ... + 2923960.

Almost surely, 2^{1984166721904} is an apocalyptic number.

It is an amenable number.

1984166721904 is a deficient number, since it is larger than the sum of its proper divisors (1949486918864).

1984166721904 is a wasteful number, since it uses less digits than its factorization.

1984166721904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064913 (or 5064907 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 1984166721904 in words is "one trillion, nine hundred eighty-four billion, one hundred sixty-six million, seven hundred twenty-one thousand, nine hundred four".