216458781456 has 160 divisors (see below), whose sum is σ = 574901203968. Its totient is φ = 70152609280.

The previous prime is 216458781443. The next prime is 216458781467. The reversal of 216458781456 is 654187854612.

It is a junction number, because it is equal to n+sod(n) for n = 216458781396 and 216458781405.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198403471 + ... + 198404561.

Almost surely, 2^216458781456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216458781456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287450601984).

216458781456 is an abundant number, since it is smaller than the sum of its proper divisors (358442422512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216458781456 is a wasteful number, since it uses less digits than its factorization.

216458781456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1783 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 57.

The spelling of 216458781456 in words is "two hundred sixteen billion, four hundred fifty-eight million, seven hundred eighty-one thousand, four hundred fifty-six".