1681555842 has 32 divisors (see below), whose sum is σ = 3738389760. Its totient is φ = 560278800.

The previous prime is 1681555831. The next prime is 1681555859. The reversal of 1681555842 is 2485551861.

1681555842 is a `hidden beast` number, since 1 + 68 + 1 + 5 + 5 + 584 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158092 + ... + 168392.

It is an arithmetic number, because the mean of its divisors is an integer number (116824680).

Almost surely, 2^1681555842 is an apocalyptic number.

1681555842 is an abundant number, since it is smaller than the sum of its proper divisors (2056833918).

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

1681555842 is a wasteful number, since it uses less digits than its factorization.

1681555842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13335 (or 13329 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The square root of 1681555842 is about 41006.7780007159. The cubic root of 1681555842 is about 1189.1512536519.

The spelling of 1681555842 in words is "one billion, six hundred eighty-one million, five hundred fifty-five thousand, eight hundred forty-two".