17666661057 has 8 divisors (see below), whose sum is σ = 23560850976. Its totient is φ = 11775122592.

The previous prime is 17666661049. The next prime is 17666661079. The reversal of 17666661057 is 75016666671.

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

It is not a de Polignac number, because 17666661057 - 2³ = 17666661049 is a prime.

It is a super-2 number, since 2×17666661057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17666661037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647263 + ... + 674004.

It is an arithmetic number, because the mean of its divisors is an integer number (2945106372).

Almost surely, 2^17666661057 is an apocalyptic number.

It is an amenable number.

17666661057 is a deficient number, since it is larger than the sum of its proper divisors (5894189919).

17666661057 is a wasteful number, since it uses less digits than its factorization.

17666661057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325727.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 17666661057 in words is "seventeen billion, six hundred sixty-six million, six hundred sixty-one thousand, fifty-seven".