216694646485 has 12 divisors (see below), whose sum is σ = 263972628108. Its totient is φ = 170768300736.

The previous prime is 216694646473. The next prime is 216694646513. The reversal of 216694646485 is 584646496612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171556669636 + 45137976849 = 414194^2 + 212457^2 .

It is not a de Polignac number, because 216694646485 - 2³⁵ = 182334908117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4804792 + ... + 4849681.

It is an arithmetic number, because the mean of its divisors is an integer number (21997719009).

Almost surely, 2^216694646485 is an apocalyptic number.

It is an amenable number.

216694646485 is a deficient number, since it is larger than the sum of its proper divisors (47277981623).

216694646485 is an frugal number, since it uses more digits than its factorization.

216694646485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9654612 (or 9654545 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 61.

The spelling of 216694646485 in words is "two hundred sixteen billion, six hundred ninety-four million, six hundred forty-six thousand, four hundred eighty-five".