6555661500016 has 80 divisors (see below), whose sum is σ = 13537932356160. Its totient is φ = 3070276392960.

The previous prime is 6555661500013. The next prime is 6555661500043. The reversal of 6555661500016 is 6100051665556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555661500013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479781 + ... + 3652603.

It is an arithmetic number, because the mean of its divisors is an integer number (169224154452).

Almost surely, 2^{6555661500016} 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 6555661500016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6768966178080).

6555661500016 is an abundant number, since it is smaller than the sum of its proper divisors (6982270856144).

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

6555661500016 is a wasteful number, since it uses less digits than its factorization.

6555661500016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172994 (or 3172988 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 6555661500016 in words is "six trillion, five hundred fifty-five billion, six hundred sixty-one million, five hundred thousand, sixteen".