1623664011643 has 16 divisors (see below), whose sum is σ = 1658397532896.
Its totient is φ = 1589084340480.
The previous prime is 1623664011623. The next prime is 1623664011653. The reversal of 1623664011643 is 3461104663261.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1623664011643 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 1623664011643.
It is not an unprimeable number, because it can be changed into a prime (1623664011623) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109544173 + ... + 109558993.
It is an arithmetic number, because the mean of its divisors is an integer number (103649845806).
Almost surely, 21623664011643 is an apocalyptic number.
1623664011643 is a deficient number, since it is larger than the sum of its proper divisors (34733521253).
1623664011643 is a wasteful number, since it uses less digits than its factorization.
1623664011643 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19854.
The product of its (nonzero) digits is 373248, while the sum is 43.
The spelling of 1623664011643 in words is "one trillion, six hundred twenty-three billion, six hundred sixty-four million, eleven thousand, six hundred forty-three".