1685120664 has 64 divisors (see below), whose sum is σ = 4337958240. Its totient is φ = 545162240.

The previous prime is 1685120629. The next prime is 1685120683. The reversal of 1685120664 is 4660215861.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189502 + ... + 198194.

Almost surely, 2^1685120664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685120664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2168979120).

1685120664 is an abundant number, since it is smaller than the sum of its proper divisors (2652837576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685120664 is a wasteful number, since it uses less digits than its factorization.

1685120664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8940 (or 8936 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1685120664 is about 41050.2212417911. The cubic root of 1685120664 is about 1189.9909760867.

The spelling of 1685120664 in words is "one billion, six hundred eighty-five million, one hundred twenty thousand, six hundred sixty-four".