648820556057 has 2 divisors, whose sum is σ = 648820556058. Its totient is φ = 648820556056.

The previous prime is 648820556017. The next prime is 648820556077. The reversal of 648820556057 is 750655028846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337260109081 + 311560446976 = 580741^2 + 558176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648820556057 is a prime.

It is a super-2 number, since 2×648820556057² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648820555993 and 648820556011.

It is not a weakly prime, because it can be changed into another prime (648820556017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324410278028 + 324410278029.

It is an arithmetic number, because the mean of its divisors is an integer number (324410278029).

Almost surely, 2^648820556057 is an apocalyptic number.

It is an amenable number.

648820556057 is a deficient number, since it is larger than the sum of its proper divisors (1).

648820556057 is an equidigital number, since it uses as much as digits as its factorization.

648820556057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 648820556057 in words is "six hundred forty-eight billion, eight hundred twenty million, five hundred fifty-six thousand, fifty-seven".