648856853 has 2 divisors, whose sum is σ = 648856854. Its totient is φ = 648856852.

The previous prime is 648856849. The next prime is 648856883. The reversal of 648856853 is 358658846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538564849 + 110292004 = 23207^2 + 10502^2 .

It is a cyclic number.

It is not a de Polignac number, because 648856853 - 2² = 648856849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648856795 and 648856804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648856883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324428426 + 324428427.

It is an arithmetic number, because the mean of its divisors is an integer number (324428427).

Almost surely, 2^648856853 is an apocalyptic number.

It is an amenable number.

648856853 is a deficient number, since it is larger than the sum of its proper divisors (1).

648856853 is an equidigital number, since it uses as much as digits as its factorization.

648856853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5529600, while the sum is 53.

The square root of 648856853 is about 25472.6687451472. The cubic root of 648856853 is about 865.7309926695.

The spelling of 648856853 in words is "six hundred forty-eight million, eight hundred fifty-six thousand, eight hundred fifty-three".