1866085856154 has 24 divisors (see below), whose sum is σ = 4354200331572. Its totient is φ = 574180263360.

The previous prime is 1866085856143. The next prime is 1866085856269. The reversal of 1866085856154 is 4516585806681.

1866085856154 is a `hidden beast` number, since 1 + 8 + 6 + 6 + 0 + 8 + 5 + 8 + 5 + 615 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1532215681929 + 333870174225 = 1237827^2 + 577815^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1866085856091 and 1866085856100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3987362707 + ... + 3987363174.

Almost surely, 2^{1866085856154} is an apocalyptic number.

1866085856154 is an abundant number, since it is smaller than the sum of its proper divisors (2488114475418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866085856154 is a wasteful number, since it uses less digits than its factorization.

1866085856154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974725902 (or 7974725899 counting only the distinct ones).

The product of its (nonzero) digits is 55296000, while the sum is 63.

The spelling of 1866085856154 in words is "one trillion, eight hundred sixty-six billion, eighty-five million, eight hundred fifty-six thousand, one hundred fifty-four".