1666704011616 has 1440 divisors, whose sum is σ = 6410128741632. Its totient is φ = 421382062080.

The previous prime is 1666704011591. The next prime is 1666704011641. The reversal of 1666704011616 is 6161104076661.

It is an interprime number because it is at equal distance from previous prime (1666704011591) and next prime (1666704011641).

It is a congruent number.

It is an unprimeable number.

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 239 ways as a sum of consecutive naturals, for example, 2476528656 + ... + 2476529328.

Almost surely, 2^{1666704011616} is an apocalyptic number.

1666704011616 is a gapful number since it is divisible by the number (16) 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 1666704011616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3205064370816).

1666704011616 is an abundant number, since it is smaller than the sum of its proper divisors (4743424730016).

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

1666704011616 is a wasteful number, since it uses less digits than its factorization.

1666704011616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 1666704011616 in words is "one trillion, six hundred sixty-six billion, seven hundred four million, eleven thousand, six hundred sixteen".