648056477 has 2 divisors, whose sum is σ = 648056478. Its totient is φ = 648056476.

The previous prime is 648056429. The next prime is 648056491. The reversal of 648056477 is 774650846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544708921 + 103347556 = 23339^2 + 10166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648056477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648056407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324028238 + 324028239.

It is an arithmetic number, because the mean of its divisors is an integer number (324028239).

Almost surely, 2^648056477 is an apocalyptic number.

It is an amenable number.

648056477 is a deficient number, since it is larger than the sum of its proper divisors (1).

648056477 is an equidigital number, since it uses as much as digits as its factorization.

648056477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 47.

The square root of 648056477 is about 25456.9534115927. The cubic root of 648056477 is about 865.3748815556.

The spelling of 648056477 in words is "six hundred forty-eight million, fifty-six thousand, four hundred seventy-seven".