1666843365 has 24 divisors (see below), whose sum is σ = 2931443424. Its totient is φ = 808165600.

The previous prime is 1666843351. The next prime is 1666843403. The reversal of 1666843365 is 5633486661.

It is not a de Polignac number, because 1666843365 - 2⁴ = 1666843349 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457371 + ... + 461000.

It is an arithmetic number, because the mean of its divisors is an integer number (122143476).

Almost surely, 2^1666843365 is an apocalyptic number.

1666843365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666843365 is a deficient number, since it is larger than the sum of its proper divisors (1264600059).

1666843365 is a wasteful number, since it uses less digits than its factorization.

1666843365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918401 (or 918390 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 48.

The square root of 1666843365 is about 40826.9930928056. The cubic root of 1666843365 is about 1185.6729998240.

The spelling of 1666843365 in words is "one billion, six hundred sixty-six million, eight hundred forty-three thousand, three hundred sixty-five".