1616668166661 has 8 divisors (see below), whose sum is σ = 2155707419040. Its totient is φ = 1077703846032.

The previous prime is 1616668166639. The next prime is 1616668166671. The reversal of 1616668166661 is 1666618666161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1616668166661 - 2⁹ = 1616668166149 is a prime.

It is a super-2 number, since 2×1616668166661² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616668166595 and 1616668166604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616668166671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18682575 + ... + 18768908.

It is an arithmetic number, because the mean of its divisors is an integer number (269463427380).

Almost surely, 2^{1616668166661} is an apocalyptic number.

It is an amenable number.

1616668166661 is a deficient number, since it is larger than the sum of its proper divisors (539039252379).

1616668166661 is a wasteful number, since it uses less digits than its factorization.

1616668166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37465875.

The product of its digits is 13436928, while the sum is 60.

The spelling of 1616668166661 in words is "one trillion, six hundred sixteen billion, six hundred sixty-eight million, one hundred sixty-six thousand, six hundred sixty-one".