6645194497116 has 288 divisors, whose sum is σ = 21197137328640. Its totient is φ = 1776954599424.

The previous prime is 6645194497111. The next prime is 6645194497129. The reversal of 6645194497116 is 6117944915466.

6645194497116 is a `hidden beast` number, since 6 + 6 + 4 + 51 + 94 + 497 + 1 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645194497111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20544096 + ... + 20865048.

It is an arithmetic number, because the mean of its divisors is an integer number (73601171280).

Almost surely, 2^{6645194497116} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6645194497116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10598568664320).

6645194497116 is an abundant number, since it is smaller than the sum of its proper divisors (14551942831524).

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

6645194497116 is a wasteful number, since it uses less digits than its factorization.

6645194497116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321175 (or 321161 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

It can be divided in two parts, 6645194 and 497116, that added together give a triangular number (7142310 = T₃₇₇₉).

The spelling of 6645194497116 in words is "six trillion, six hundred forty-five billion, one hundred ninety-four million, four hundred ninety-seven thousand, one hundred sixteen".