1666222001616 has 40 divisors (see below), whose sum is σ = 4304976165280. Its totient is φ = 555333872256.

The previous prime is 1666222001593. The next prime is 1666222001663. The reversal of 1666222001616 is 6161002226661.

It is a super-2 number, since 2×1666222001616² (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, 1928386 + ... + 2655393.

It is an arithmetic number, because the mean of its divisors is an integer number (107624404132).

Almost surely, 2^{1666222001616} is an apocalyptic number.

1666222001616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666222001616 is an abundant number, since it is smaller than the sum of its proper divisors (2638754163664).

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

1666222001616 is a wasteful number, since it uses less digits than its factorization.

1666222001616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591363 (or 4591357 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 1666222001616 in words is "one trillion, six hundred sixty-six billion, two hundred twenty-two million, one thousand, six hundred sixteen".