1666340324405 has 16 divisors (see below), whose sum is σ = 2009179444800. Its totient is φ = 1326698576640.

The previous prime is 1666340324401. The next prime is 1666340324431. The reversal of 1666340324405 is 5044230436661.

It is not a de Polignac number, because 1666340324405 - 2² = 1666340324401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666340324401) 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, 1464806 + ... + 2340584.

It is an arithmetic number, because the mean of its divisors is an integer number (125573715300).

Almost surely, 2^{1666340324405} is an apocalyptic number.

It is an amenable number.

1666340324405 is a deficient number, since it is larger than the sum of its proper divisors (342839120395).

1666340324405 is a wasteful number, since it uses less digits than its factorization.

1666340324405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877604.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 1666340324405 in words is "one trillion, six hundred sixty-six billion, three hundred forty million, three hundred twenty-four thousand, four hundred five".