1664723529543 has 8 divisors (see below), whose sum is σ = 2235833062128. Its totient is φ = 1101714841664.

The previous prime is 1664723529431. The next prime is 1664723529569. The reversal of 1664723529543 is 3459253274661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664723529543 - 2¹² = 1664723525447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664723529943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025210696 + ... + 2025211517.

It is an arithmetic number, because the mean of its divisors is an integer number (279479132766).

Almost surely, 2^{1664723529543} is an apocalyptic number.

1664723529543 is a deficient number, since it is larger than the sum of its proper divisors (571109532585).

1664723529543 is a wasteful number, since it uses less digits than its factorization.

1664723529543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050422353.

The product of its digits is 32659200, while the sum is 57.

The spelling of 1664723529543 in words is "one trillion, six hundred sixty-four billion, seven hundred twenty-three million, five hundred twenty-nine thousand, five hundred forty-three".