1664326432535 has 16 divisors (see below), whose sum is σ = 2277340785216. Its totient is φ = 1156744524288.

The previous prime is 1664326432499. The next prime is 1664326432537. The reversal of 1664326432535 is 5352346234661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1664326432535 - 2¹² = 1664326428439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664326432537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753087779 + ... + 753089988.

It is an arithmetic number, because the mean of its divisors is an integer number (142333799076).

Almost surely, 2^{1664326432535} is an apocalyptic number.

1664326432535 is a deficient number, since it is larger than the sum of its proper divisors (613014352681).

1664326432535 is a wasteful number, since it uses less digits than its factorization.

1664326432535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506177802.

The product of its digits is 9331200, while the sum is 50.

The spelling of 1664326432535 in words is "one trillion, six hundred sixty-four billion, three hundred twenty-six million, four hundred thirty-two thousand, five hundred thirty-five".