1685680975 has 24 divisors (see below), whose sum is σ = 2288782080. Its totient is φ = 1221372000.

The previous prime is 1685680961. The next prime is 1685680987. The reversal of 1685680975 is 5790865861.

It is not a de Polignac number, because 1685680975 - 2⁵ = 1685680943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63216 + ... + 85834.

It is an arithmetic number, because the mean of its divisors is an integer number (95365920).

Almost surely, 2^1685680975 is an apocalyptic number.

1685680975 is a deficient number, since it is larger than the sum of its proper divisors (603101105).

1685680975 is a wasteful number, since it uses less digits than its factorization.

1685680975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911 (or 22906 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 1685680975 is about 41057.0453759157. The cubic root of 1685680975 is about 1190.1228541100.

The spelling of 1685680975 in words is "one billion, six hundred eighty-five million, six hundred eighty thousand, nine hundred seventy-five".