1685381255 has 16 divisors (see below), whose sum is σ = 2107274400. Its totient is φ = 1292430720.

The previous prime is 1685381251. The next prime is 1685381267. The reversal of 1685381255 is 5521835861.

It is not a de Polignac number, because 1685381255 - 2² = 1685381251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685381251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21656 + ... + 61965.

It is an arithmetic number, because the mean of its divisors is an integer number (131704650).

Almost surely, 2^1685381255 is an apocalyptic number.

1685381255 is a deficient number, since it is larger than the sum of its proper divisors (421893145).

1685381255 is a wasteful number, since it uses less digits than its factorization.

1685381255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83794.

The product of its digits is 288000, while the sum is 44.

The square root of 1685381255 is about 41053.3951701927. The cubic root of 1685381255 is about 1190.0523139208.

The spelling of 1685381255 in words is "one billion, six hundred eighty-five million, three hundred eighty-one thousand, two hundred fifty-five".