17666868545 has 4 divisors (see below), whose sum is σ = 21200242260. Its totient is φ = 14133494832.

The previous prime is 17666868539. The next prime is 17666868551. The reversal of 17666868545 is 54586866671.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54586866671 = 1039 ⋅52537889.

It is an interprime number because it is at equal distance from previous prime (17666868539) and next prime (17666868551).

It can be written as a sum of positive squares in 2 ways, for example, as 2627280049 + 15039588496 = 51257^2 + 122636^2 .

It is a cyclic number.

It is not a de Polignac number, because 17666868545 - 2¹⁰ = 17666867521 is a prime.

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, 1766686850 + ... + 1766686859.

It is an arithmetic number, because the mean of its divisors is an integer number (5300060565).

Almost surely, 2^17666868545 is an apocalyptic number.

It is an amenable number.

17666868545 is a deficient number, since it is larger than the sum of its proper divisors (3533373715).

17666868545 is an equidigital number, since it uses as much as digits as its factorization.

17666868545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533373714.

The product of its digits is 58060800, while the sum is 62.

The spelling of 17666868545 in words is "seventeen billion, six hundred sixty-six million, eight hundred sixty-eight thousand, five hundred forty-five".