1685587578404 has 12 divisors (see below), whose sum is σ = 2949788047500. Its totient is φ = 842790993408.

The previous prime is 1685587578401. The next prime is 1685587578421. The reversal of 1685587578404 is 4048757855861.

It can be written as a sum of positive squares in 2 ways, for example, as 948582498304 + 737005080100 = 973952^2 + 858490^2 .

It is not an unprimeable number, because it can be changed into a prime (1685587578401) 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, 1280372 + ... + 2238420.

It is an arithmetic number, because the mean of its divisors is an integer number (245815670625).

Almost surely, 2^{1685587578404} is an apocalyptic number.

It is an amenable number.

1685587578404 is a deficient number, since it is larger than the sum of its proper divisors (1264200469096).

1685587578404 is a wasteful number, since it uses less digits than its factorization.

1685587578404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397902 (or 1397900 counting only the distinct ones).

The product of its (nonzero) digits is 301056000, while the sum is 68.

The spelling of 1685587578404 in words is "one trillion, six hundred eighty-five billion, five hundred eighty-seven million, five hundred seventy-eight thousand, four hundred four".