17660666543 has 8 divisors (see below), whose sum is σ = 19020818208. Its totient is φ = 16300749024.

The previous prime is 17660666537. The next prime is 17660666567. The reversal of 17660666543 is 34566606671.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 17660666543 - 2²⁶ = 17593557679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17660666491 and 17660666500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17660666533) 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, 117821 + ... + 221817.

It is an arithmetic number, because the mean of its divisors is an integer number (2377602276).

Almost surely, 2^17660666543 is an apocalyptic number.

17660666543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

17660666543 is a deficient number, since it is larger than the sum of its proper divisors (1360151665).

17660666543 is a wasteful number, since it uses less digits than its factorization.

17660666543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117073.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The spelling of 17660666543 in words is "seventeen billion, six hundred sixty million, six hundred sixty-six thousand, five hundred forty-three".