1685625553 has 4 divisors (see below), whose sum is σ = 1708716388. Its totient is φ = 1662534720.

The previous prime is 1685625509. The next prime is 1685625563. The reversal of 1685625553 is 3555265861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1271421649 + 414203904 = 35657^2 + 20352^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685625553 - 2⁹ = 1685625041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685625563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11545308 + ... + 11545453.

It is an arithmetic number, because the mean of its divisors is an integer number (427179097).

Almost surely, 2^1685625553 is an apocalyptic number.

It is an amenable number.

1685625553 is a deficient number, since it is larger than the sum of its proper divisors (23090835).

1685625553 is an equidigital number, since it uses as much as digits as its factorization.

1685625553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23090834.

The product of its digits is 1080000, while the sum is 46.

The square root of 1685625553 is about 41056.3704313959. The cubic root of 1685625553 is about 1190.1098109715.

The spelling of 1685625553 in words is "one billion, six hundred eighty-five million, six hundred twenty-five thousand, five hundred fifty-three".