1665501066611 has 2 divisors, whose sum is σ = 1665501066612. Its totient is φ = 1665501066610.

The previous prime is 1665501066589. The next prime is 1665501066641. The reversal of 1665501066611 is 1166601055661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665501066611 - 2⁶ = 1665501066547 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665501066641) 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 as a sum of consecutive naturals, namely, 832750533305 + 832750533306.

It is an arithmetic number, because the mean of its divisors is an integer number (832750533306).

Almost surely, 2^{1665501066611} is an apocalyptic number.

1665501066611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665501066611 is an equidigital number, since it uses as much as digits as its factorization.

1665501066611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 1665501066611 in words is "one trillion, six hundred sixty-five billion, five hundred one million, sixty-six thousand, six hundred eleven".