216458781457 has 8 divisors (see below), whose sum is σ = 216744492800. Its totient is φ = 216173181024.

The previous prime is 216458781443. The next prime is 216458781467. The reversal of 216458781457 is 754187854612.

216458781457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216458781457 - 2²³ = 216450392849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216458781467) 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, 4321048 + ... + 4370854.

It is an arithmetic number, because the mean of its divisors is an integer number (27093061600).

Almost surely, 2^216458781457 is an apocalyptic number.

It is an amenable number.

216458781457 is a deficient number, since it is larger than the sum of its proper divisors (285711343).

216458781457 is an equidigital number, since it uses as much as digits as its factorization.

216458781457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55455.

The product of its digits is 15052800, while the sum is 58.

The spelling of 216458781457 in words is "two hundred sixteen billion, four hundred fifty-eight million, seven hundred eighty-one thousand, four hundred fifty-seven".