216458781405 has 16 divisors (see below), whose sum is σ = 347122976640. Its totient is φ = 115181707968.

The previous prime is 216458781353. The next prime is 216458781443. The reversal of 216458781405 is 504187854612.

It is a happy number.

It is not a de Polignac number, because 216458781405 - 2¹² = 216458777309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16429162 + ... + 16442331.

It is an arithmetic number, because the mean of its divisors is an integer number (21695186040).

Almost surely, 2^216458781405 is an apocalyptic number.

It is an amenable number.

216458781405 is a deficient number, since it is larger than the sum of its proper divisors (130664195235).

216458781405 is a wasteful number, since it uses less digits than its factorization.

216458781405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32871940.

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 216458781405 in words is "two hundred sixteen billion, four hundred fifty-eight million, seven hundred eighty-one thousand, four hundred five".