6216393645 has 48 divisors (see below), whose sum is σ = 13433876352. Its totient is φ = 2583434880.

The previous prime is 6216393619. The next prime is 6216393661. The reversal of 6216393645 is 5463936126.

6216393645 is a `hidden beast` number, since 6 + 2 + 1 + 639 + 3 + 6 + 4 + 5 = 666.

It is not a de Polignac number, because 6216393645 - 2⁶ = 6216393581 is a prime.

It is a super-3 number, since 3×6216393645³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6216393645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 893562 + ... + 900491.

It is an arithmetic number, because the mean of its divisors is an integer number (279872424).

Almost surely, 2^6216393645 is an apocalyptic number.

It is an amenable number.

6216393645 is an abundant number, since it is smaller than the sum of its proper divisors (7217482707).

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

6216393645 is a wasteful number, since it uses less digits than its factorization.

6216393645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794082 (or 1794079 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 6216393645 is about 78844.1097673124. The cubic root of 6216393645 is about 1838.7082975999.

The spelling of 6216393645 in words is "six billion, two hundred sixteen million, three hundred ninety-three thousand, six hundred forty-five".