6511620672 has 56 divisors (see below), whose sum is σ = 19142964000. Its totient is φ = 2170539648.

The previous prime is 6511620667. The next prime is 6511620673. The reversal of 6511620672 is 2760261156.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6511620673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1882422 + ... + 1885877.

Almost surely, 2^6511620672 is an apocalyptic number.

It is an amenable number.

6511620672 is an abundant number, since it is smaller than the sum of its proper divisors (12631343328).

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

6511620672 is a wasteful number, since it uses less digits than its factorization.

6511620672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3768320 (or 3768304 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 6511620672 is about 80694.6136492393. The cubic root of 6511620672 is about 1867.3670775217.

The spelling of 6511620672 in words is "six billion, five hundred eleven million, six hundred twenty thousand, six hundred seventy-two".