1666065005 has 16 divisors (see below), whose sum is σ = 2182680000. Its totient is φ = 1210767360.

The previous prime is 1666064963. The next prime is 1666065019. The reversal of 1666065005 is 5005606661.

It is not a de Polignac number, because 1666065005 - 2¹⁶ = 1665999469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66746 + ... + 88244.

It is an arithmetic number, because the mean of its divisors is an integer number (136417500).

Almost surely, 2^1666065005 is an apocalyptic number.

It is an amenable number.

1666065005 is a deficient number, since it is larger than the sum of its proper divisors (516614995).

1666065005 is a wasteful number, since it uses less digits than its factorization.

1666065005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22924.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1666065005 is about 40817.4595608301. The cubic root of 1666065005 is about 1185.4884145685.

The spelling of 1666065005 in words is "one billion, six hundred sixty-six million, sixty-five thousand, five".