1685695505 has 8 divisors (see below), whose sum is σ = 2178437352. Its totient is φ = 1244821248.

The previous prime is 1685695471. The next prime is 1685695541. The reversal of 1685695505 is 5055965861.

It can be written as a sum of positive squares in 4 ways, for example, as 2808976 + 1682886529 = 1676^2 + 41023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1685695505 - 2¹⁰ = 1685694481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12966824 + ... + 12966953.

It is an arithmetic number, because the mean of its divisors is an integer number (272304669).

Almost surely, 2^1685695505 is an apocalyptic number.

It is an amenable number.

1685695505 is a deficient number, since it is larger than the sum of its proper divisors (492741847).

1685695505 is a wasteful number, since it uses less digits than its factorization.

1685695505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25933795.

The product of its (nonzero) digits is 1620000, while the sum is 50.

The square root of 1685695505 is about 41057.2223244583. Note that the first 3 decimals coincide. The cubic root of 1685695505 is about 1190.1262735857.

The spelling of 1685695505 in words is "one billion, six hundred eighty-five million, six hundred ninety-five thousand, five hundred five".