1681559855 has 16 divisors (see below), whose sum is σ = 2100990528. Its totient is φ = 1290912000.

The previous prime is 1681559839. The next prime is 1681559881. The reversal of 1681559855 is 5589551861.

It is not a de Polignac number, because 1681559855 - 2⁴ = 1681559839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681559797 and 1681559806.

It is a congruent number.

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, 54731 + ... + 79740.

It is an arithmetic number, because the mean of its divisors is an integer number (131311908).

Almost surely, 2^1681559855 is an apocalyptic number.

1681559855 is a deficient number, since it is larger than the sum of its proper divisors (419430673).

1681559855 is a wasteful number, since it uses less digits than its factorization.

1681559855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134578.

The product of its digits is 2160000, while the sum is 53.

The square root of 1681559855 is about 41006.8269316220. The cubic root of 1681559855 is about 1189.1521996132.

The spelling of 1681559855 in words is "one billion, six hundred eighty-one million, five hundred fifty-nine thousand, eight hundred fifty-five".