1664141066440 has 32 divisors (see below), whose sum is σ = 3744354428280. Its totient is φ = 665649843712.

The previous prime is 1664141066411. The next prime is 1664141066443. The reversal of 1664141066440 is 446601414661.

It can be written as a sum of positive squares in 4 ways, for example, as 1190992438276 + 473148628164 = 1091326^2 + 687858^2 .

It is not an unprimeable number, because it can be changed into a prime (1664141066443) 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, 7042692 + ... + 7275148.

Almost surely, 2^{1664141066440} is an apocalyptic number.

1664141066440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664141066440 is an abundant number, since it is smaller than the sum of its proper divisors (2080213361840).

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

1664141066440 is a wasteful number, since it uses less digits than its factorization.

1664141066440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411441 (or 411437 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 1664141066440 in words is "one trillion, six hundred sixty-four billion, one hundred forty-one million, sixty-six thousand, four hundred forty".