1666651565116 has 12 divisors (see below), whose sum is σ = 2916912668040. Its totient is φ = 833247945680.

The previous prime is 1666651565083. The next prime is 1666651565141. The reversal of 1666651565116 is 6115651566661.

It is a super-2 number, since 2×1666651565116² (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 3 ways as a sum of consecutive naturals, for example, 19411030 + ... + 19496701.

It is an arithmetic number, because the mean of its divisors is an integer number (243076055670).

Almost surely, 2^{1666651565116} is an apocalyptic number.

It is an amenable number.

1666651565116 is a deficient number, since it is larger than the sum of its proper divisors (1250261102924).

1666651565116 is a wasteful number, since it uses less digits than its factorization.

1666651565116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38918444 (or 38918442 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

The spelling of 1666651565116 in words is "one trillion, six hundred sixty-six billion, six hundred fifty-one million, five hundred sixty-five thousand, one hundred sixteen".