6721241538816 has 288 divisors, whose sum is σ = 23702933022720. Its totient is φ = 1836860737536.

The previous prime is 6721241538743. The next prime is 6721241538827. The reversal of 6721241538816 is 6188351421276.

It is a happy number.

6721241538816 is a `hidden beast` number, since 6 + 7 + 2 + 1 + 24 + 1 + 538 + 81 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1907050 + ... + 4132713.

Almost surely, 2^{6721241538816} is an apocalyptic number.

It is an amenable number.

6721241538816 is an abundant number, since it is smaller than the sum of its proper divisors (16981691483904).

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

6721241538816 is a wasteful number, since it uses less digits than its factorization.

6721241538816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039818 (or 6039798 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 6721241538816 in words is "six trillion, seven hundred twenty-one billion, two hundred forty-one million, five hundred thirty-eight thousand, eight hundred sixteen".