17660666491 has 16 divisors (see below), whose sum is σ = 19097455104. Its totient is φ = 16235208864.

The previous prime is 17660666477. The next prime is 17660666501. The reversal of 17660666491 is 19466606671.

It is a cyclic number.

It is not a de Polignac number, because 17660666491 - 2¹⁵ = 17660633723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17660666791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3415390 + ... + 3420556.

It is an arithmetic number, because the mean of its divisors is an integer number (1193590944).

Almost surely, 2^17660666491 is an apocalyptic number.

17660666491 is a deficient number, since it is larger than the sum of its proper divisors (1436788613).

17660666491 is a wasteful number, since it uses less digits than its factorization.

17660666491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 17660666491 in words is "seventeen billion, six hundred sixty million, six hundred sixty-six thousand, four hundred ninety-one".