216897280001 has 24 divisors (see below), whose sum is σ = 225024971640. Its totient is φ = 209037496320.

The previous prime is 216897279913. The next prime is 216897280049. The reversal of 216897280001 is 100082798612.

It can be written as a sum of positive squares in 12 ways, for example, as 148213450225 + 68683829776 = 384985^2 + 262076^2 .

It is not a de Polignac number, because 216897280001 - 2³⁴ = 199717410817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216897280051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129955595 + ... + 129957263.

It is an arithmetic number, because the mean of its divisors is an integer number (9376040485).

Almost surely, 2^216897280001 is an apocalyptic number.

It is an amenable number.

216897280001 is a deficient number, since it is larger than the sum of its proper divisors (8127691639).

216897280001 is an equidigital number, since it uses as much as digits as its factorization.

216897280001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645 (or 2604 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 216897280001 in words is "two hundred sixteen billion, eight hundred ninety-seven million, two hundred eighty thousand, one".