1666140343 has 16 divisors (see below), whose sum is σ = 2005719040. Its totient is φ = 1352052000.

The previous prime is 1666140341. The next prime is 1666140367. The reversal of 1666140343 is 3430416661.

It is a cyclic number.

It is not a de Polignac number, because 1666140343 - 2¹ = 1666140341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666140299 and 1666140308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666140341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256273 + ... + 262693.

It is an arithmetic number, because the mean of its divisors is an integer number (125357440).

Almost surely, 2^1666140343 is an apocalyptic number.

1666140343 is a deficient number, since it is larger than the sum of its proper divisors (339578697).

1666140343 is a wasteful number, since it uses less digits than its factorization.

1666140343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8398.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 1666140343 is about 40818.3824152795. The cubic root of 1666140343 is about 1185.5062832151.

The spelling of 1666140343 in words is "one billion, six hundred sixty-six million, one hundred forty thousand, three hundred forty-three".