648820556065 has 8 divisors (see below), whose sum is σ = 849365091648. Its totient is φ = 471869495280.

The previous prime is 648820556057. The next prime is 648820556077. The reversal of 648820556065 is 560655028846.

It is a happy number.

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

It is not a de Polignac number, because 648820556065 - 2³ = 648820556057 is a prime.

It is a super-2 number, since 2×648820556065² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 11796737383 = 648820556065 / (6 + 4 + 8 + 8 + 2 + 0 + 5 + 5 + 6 + 0 + 6 + 5).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648820555997 and 648820556015.

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 7 ways as a sum of consecutive naturals, for example, 5898368637 + ... + 5898368746.

It is an arithmetic number, because the mean of its divisors is an integer number (106170636456).

Almost surely, 2^648820556065 is an apocalyptic number.

It is an amenable number.

648820556065 is a deficient number, since it is larger than the sum of its proper divisors (200544535583).

648820556065 is a wasteful number, since it uses less digits than its factorization.

648820556065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11796737399.

The product of its (nonzero) digits is 13824000, while the sum is 55.

The spelling of 648820556065 in words is "six hundred forty-eight billion, eight hundred twenty million, five hundred fifty-six thousand, sixty-five".