216840042456445 has 16 divisors (see below), whose sum is σ = 276898901414400. Its totient is φ = 162447355471104.

The previous prime is 216840042456431. The next prime is 216840042456461. The reversal of 216840042456445 is 544654240048612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216840042456445 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 6409679877 + ... + 6409713706.

It is an arithmetic number, because the mean of its divisors is an integer number (17306181338400).

Almost surely, 2^{216840042456445} is an apocalyptic number.

It is an amenable number.

216840042456445 is a deficient number, since it is larger than the sum of its proper divisors (60058858957955).

216840042456445 is a wasteful number, since it uses less digits than its factorization.

216840042456445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12819393804.

The product of its (nonzero) digits is 29491200, while the sum is 55.

The spelling of 216840042456445 in words is "two hundred sixteen trillion, eight hundred forty billion, forty-two million, four hundred fifty-six thousand, four hundred forty-five".