1685898897 has 8 divisors (see below), whose sum is σ = 2271039456. Its totient is φ = 1112345472.

The previous prime is 1685898869. The next prime is 1685898911. The reversal of 1685898897 is 7988985861.

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

It is not a de Polignac number, because 1685898897 - 2¹⁵ = 1685866129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1685898397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2896443 + ... + 2897024.

It is an arithmetic number, because the mean of its divisors is an integer number (283879932).

Almost surely, 2^1685898897 is an apocalyptic number.

It is an amenable number.

1685898897 is a deficient number, since it is larger than the sum of its proper divisors (585140559).

1685898897 is an equidigital number, since it uses as much as digits as its factorization.

1685898897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793567.

The product of its digits is 69672960, while the sum is 69.

The square root of 1685898897 is about 41059.6991830189. The cubic root of 1685898897 is about 1190.1741375935.

The spelling of 1685898897 in words is "one billion, six hundred eighty-five million, eight hundred ninety-eight thousand, eight hundred ninety-seven".