6721628366007 has 40 divisors (see below), whose sum is σ = 10392170619600. Its totient is φ = 4324491110016.

The previous prime is 6721628365999. The next prime is 6721628366009. The reversal of 6721628366007 is 7006638261276.

6721628366007 is a `hidden beast` number, since 6 + 7 + 2 + 1 + 6 + 28 + 3 + 6 + 600 + 7 = 666.

It is not a de Polignac number, because 6721628366007 - 2³ = 6721628365999 is a prime.

It is a super-3 number, since 3×6721628366007³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721628366009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4222168 + ... + 5591954.

It is an arithmetic number, because the mean of its divisors is an integer number (259804265490).

Almost surely, 2^{6721628366007} is an apocalyptic number.

6721628366007 is a deficient number, since it is larger than the sum of its proper divisors (3670542253593).

6721628366007 is a wasteful number, since it uses less digits than its factorization.

6721628366007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371917 (or 1371908 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 6721628366007 in words is "six trillion, seven hundred twenty-one billion, six hundred twenty-eight million, three hundred sixty-six thousand, seven".