1664035788285 has 48 divisors (see below), whose sum is σ = 3108762222384. Its totient is φ = 818541904896.

The previous prime is 1664035788253. The next prime is 1664035788287. The reversal of 1664035788285 is 5828875304661.

1664035788285 is a `hidden beast` number, since 1 + 6 + 6 + 403 + 5 + 78 + 82 + 85 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1062091014084 + 601944774201 = 1030578^2 + 775851^2 .

It is not a de Polignac number, because 1664035788285 - 2⁵ = 1664035788253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664035788287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 462904 + ... + 1882113.

It is an arithmetic number, because the mean of its divisors is an integer number (64765879633).

Almost surely, 2^{1664035788285} is an apocalyptic number.

1664035788285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664035788285 is a deficient number, since it is larger than the sum of its proper divisors (1444726434099).

1664035788285 is a wasteful number, since it uses less digits than its factorization.

1664035788285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346254 (or 2346251 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 63.

The spelling of 1664035788285 in words is "one trillion, six hundred sixty-four billion, thirty-five million, seven hundred eighty-eight thousand, two hundred eighty-five".