1666093564509 has 16 divisors (see below), whose sum is σ = 2459579105280. Its totient is φ = 994682723760.

The previous prime is 1666093564501. The next prime is 1666093564511. The reversal of 1666093564509 is 9054653906661.

It is not a de Polignac number, because 1666093564509 - 2³ = 1666093564501 is a prime.

It is a super-2 number, since 2×1666093564509² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666093564501) 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, 376771549 + ... + 376775970.

It is an arithmetic number, because the mean of its divisors is an integer number (153723694080).

Almost surely, 2^{1666093564509} is an apocalyptic number.

It is an amenable number.

1666093564509 is a deficient number, since it is larger than the sum of its proper divisors (793485540771).

1666093564509 is a wasteful number, since it uses less digits than its factorization.

1666093564509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753547600.

The product of its (nonzero) digits is 31492800, while the sum is 60.

The spelling of 1666093564509 in words is "one trillion, six hundred sixty-six billion, ninety-three million, five hundred sixty-four thousand, five hundred nine".