1685257505 has 8 divisors (see below), whose sum is σ = 2069339712. Its totient is φ = 1316852208.

The previous prime is 1685257429. The next prime is 1685257513. The reversal of 1685257505 is 5057525861.

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 1685257505 - 2¹⁴ = 1685241121 is a prime.

It is a Duffinian number.

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, 3918989 + ... + 3919418.

It is an arithmetic number, because the mean of its divisors is an integer number (258667464).

Almost surely, 2^1685257505 is an apocalyptic number.

It is an amenable number.

1685257505 is a deficient number, since it is larger than the sum of its proper divisors (384082207).

1685257505 is an equidigital number, since it uses as much as digits as its factorization.

1685257505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7838455.

The product of its (nonzero) digits is 420000, while the sum is 44.

The square root of 1685257505 is about 41051.8879590208. The cubic root of 1685257505 is about 1190.0231864700.

The spelling of 1685257505 in words is "one billion, six hundred eighty-five million, two hundred fifty-seven thousand, five hundred five".