2161666044452 has 24 divisors (see below), whose sum is σ = 3846443145216. Its totient is φ = 1062832917888.

The previous prime is 2161666044389. The next prime is 2161666044467. The reversal of 2161666044452 is 2544406661612.

It is a junction number, because it is equal to n+sod(n) for n = 2161666044397 and 2161666044406.

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, 18771128 + ... + 18885935.

It is an arithmetic number, because the mean of its divisors is an integer number (160268464384).

Almost surely, 2^{2161666044452} is an apocalyptic number.

It is an amenable number.

2161666044452 is a deficient number, since it is larger than the sum of its proper divisors (1684777100764).

2161666044452 is a wasteful number, since it uses less digits than its factorization.

2161666044452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37657307 (or 37657305 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 2161666044452 in words is "two trillion, one hundred sixty-one billion, six hundred sixty-six million, forty-four thousand, four hundred fifty-two".