1666471772160 has 720 divisors, whose sum is σ = 6549457474560. Its totient is φ = 388576051200.

The previous prime is 1666471772159. The next prime is 1666471772227. The reversal of 1666471772160 is 612771746661.

It is a tau number, because it is divible by the number of its divisors (720).

It is a junction number, because it is equal to n+sod(n) for n = 1666471772097 and 1666471772106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182103585 + ... + 182112735.

Almost surely, 2^{1666471772160} is an apocalyptic number.

1666471772160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666471772160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3274728737280).

1666471772160 is an abundant number, since it is smaller than the sum of its proper divisors (4882985702400).

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

1666471772160 is a wasteful number, since it uses less digits than its factorization.

1666471772160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9222 (or 9193 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 1666471772160 in words is "one trillion, six hundred sixty-six billion, four hundred seventy-one million, seven hundred seventy-two thousand, one hundred sixty".