1666851850018 has 32 divisors (see below), whose sum is σ = 2665456160256. Its totient is φ = 780017080128.

The previous prime is 1666851849977. The next prime is 1666851850021. The reversal of 1666851850018 is 8100581586661.

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, 36721 + ... + 1826212.

It is an arithmetic number, because the mean of its divisors is an integer number (83295505008).

Almost surely, 2^{1666851850018} is an apocalyptic number.

1666851850018 is a deficient number, since it is larger than the sum of its proper divisors (998604310238).

1666851850018 is a wasteful number, since it uses less digits than its factorization.

1666851850018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863378.

The product of its (nonzero) digits is 2764800, while the sum is 55.

The spelling of 1666851850018 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty-one million, eight hundred fifty thousand, eighteen".