216456328647 has 64 divisors (see below), whose sum is σ = 358670592000. Its totient is φ = 128159535744.

The previous prime is 216456328577. The next prime is 216456328681. The reversal of 216456328647 is 746823654612.

216456328647 is a `hidden beast` number, since 2 + 16 + 4 + 563 + 2 + 8 + 64 + 7 = 666.

It is not a de Polignac number, because 216456328647 - 2¹² = 216456324551 is a prime.

It is a super-2 number, since 2×216456328647² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216456328593 and 216456328602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216456398647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 862129 + ... + 1084517.

It is an arithmetic number, because the mean of its divisors is an integer number (5604228000).

Almost surely, 2^216456328647 is an apocalyptic number.

216456328647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216456328647 is a deficient number, since it is larger than the sum of its proper divisors (142214263353).

216456328647 is a wasteful number, since it uses less digits than its factorization.

216456328647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222517 (or 222511 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 54.

The spelling of 216456328647 in words is "two hundred sixteen billion, four hundred fifty-six million, three hundred twenty-eight thousand, six hundred forty-seven".