1851666685185 has 16 divisors (see below), whose sum is σ = 2968556701824. Its totient is φ = 985592230272.

The previous prime is 1851666685133. The next prime is 1851666685229. The reversal of 1851666685185 is 5815866661581.

It is not a de Polignac number, because 1851666685185 - 2²⁴ = 1851649907969 is a prime.

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, 122700652 + ... + 122715741.

It is an arithmetic number, because the mean of its divisors is an integer number (185534793864).

Almost surely, 2^{1851666685185} is an apocalyptic number.

1851666685185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1851666685185 is a deficient number, since it is larger than the sum of its proper divisors (1116890016639).

1851666685185 is a wasteful number, since it uses less digits than its factorization.

1851666685185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245416904.

The product of its digits is 82944000, while the sum is 66.

The spelling of 1851666685185 in words is "one trillion, eight hundred fifty-one billion, six hundred sixty-six million, six hundred eighty-five thousand, one hundred eighty-five".