16661061727057 has 12 divisors (see below), whose sum is σ = 18315475714228. Its totient is φ = 15144701695200.

The previous prime is 16661061727049. The next prime is 16661061727067. The reversal of 16661061727057 is 75072716016661.

It can be written as a sum of positive squares in 2 ways, for example, as 4215695942656 + 12445365784401 = 2053216^2 + 3527799^2 .

It is not a de Polignac number, because 16661061727057 - 2³ = 16661061727049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16661061726989 and 16661061727007.

It is not an unprimeable number, because it can be changed into a prime (16661061727067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6737598 + ... + 8872279.

Almost surely, 2^{16661061727057} is an apocalyptic number.

It is an amenable number.

16661061727057 is a deficient number, since it is larger than the sum of its proper divisors (1654413987171).

16661061727057 is a wasteful number, since it uses less digits than its factorization.

16661061727057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15618720 (or 15618709 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 16661061727057 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, seven hundred twenty-seven thousand, fifty-seven".