16404056163666 has 48 divisors (see below), whose sum is σ = 35942223896280. Its totient is φ = 5406467109120.

The previous prime is 16404056163659. The next prime is 16404056163673. The reversal of 16404056163666 is 66636165040461.

It is an interprime number because it is at equal distance from previous prime (16404056163659) and next prime (16404056163673).

It can be written as a sum of positive squares in 4 ways, for example, as 4105911953025 + 12298144210641 = 2026305^2 + 3506871^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114985956 + ... + 115128528.

Almost surely, 2^{16404056163666} is an apocalyptic number.

16404056163666 is an abundant number, since it is smaller than the sum of its proper divisors (19538167732614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16404056163666 is a wasteful number, since it uses less digits than its factorization.

16404056163666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214491 (or 214488 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 54.

The spelling of 16404056163666 in words is "sixteen trillion, four hundred four billion, fifty-six million, one hundred sixty-three thousand, six hundred sixty-six".