6653520644 has 12 divisors (see below), whose sum is σ = 11644548300. Its totient is φ = 3326506848.

The previous prime is 6653520637. The next prime is 6653520659. The reversal of 6653520644 is 4460253566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 434305600 + 6219215044 = 20840^2 + 78862^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3542 + ... + 115410.

It is an arithmetic number, because the mean of its divisors is an integer number (970379025).

Almost surely, 2^6653520644 is an apocalyptic number.

It is an amenable number.

6653520644 is a deficient number, since it is larger than the sum of its proper divisors (4991027656).

6653520644 is a wasteful number, since it uses less digits than its factorization.

6653520644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126742 (or 126740 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

The square root of 6653520644 is about 81569.1157485479. The cubic root of 6653520644 is about 1880.8341556341.

The spelling of 6653520644 in words is "six billion, six hundred fifty-three million, five hundred twenty thousand, six hundred forty-four".