648820556066 has 8 divisors (see below), whose sum is σ = 973252985004. Its totient is φ = 324402894400.

The previous prime is 648820556057. The next prime is 648820556077. The reversal of 648820556066 is 660655028846.

It can be written as a sum of positive squares in 2 ways, for example, as 640753821841 + 8066734225 = 800471^2 + 89815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×648820556066² (a number of 24 digits) contains 22 as substring.

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, 3581315 + ... + 3758118.

Almost surely, 2^648820556066 is an apocalyptic number.

648820556066 is a deficient number, since it is larger than the sum of its proper divisors (324432428938).

648820556066 is a wasteful number, since it uses less digits than its factorization.

648820556066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383636.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 648820556066 in words is "six hundred forty-eight billion, eight hundred twenty million, five hundred fifty-six thousand, sixty-six".