3215673216549 has 6 divisors (see below), whose sum is σ = 4644861312806. Its totient is φ = 2143782144360.

The previous prime is 3215673216491. The next prime is 3215673216551. The reversal of 3215673216549 is 9456123765123.

3215673216549 is a `hidden beast` number, since 3 + 2 + 1 + 5 + 6 + 73 + 21 + 6 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2862102650625 + 353570565924 = 1691775^2 + 594618^2 .

It is not a de Polignac number, because 3215673216549 - 2¹³ = 3215673208357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3215673216495 and 3215673216504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215673206549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178648512022 + ... + 178648512039.

Almost surely, 2^{3215673216549} is an apocalyptic number.

It is an amenable number.

3215673216549 is a deficient number, since it is larger than the sum of its proper divisors (1429188096257).

3215673216549 is a wasteful number, since it uses less digits than its factorization.

3215673216549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357297024067 (or 357297024064 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 3215673216549 in words is "three trillion, two hundred fifteen billion, six hundred seventy-three million, two hundred sixteen thousand, five hundred forty-nine".