648864373 has 2 divisors, whose sum is σ = 648864374. Its totient is φ = 648864372.

The previous prime is 648864361. The next prime is 648864427. The reversal of 648864373 is 373468846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454457124 + 194407249 = 21318^2 + 13943^2 .

It is a cyclic number.

It is not a de Polignac number, because 648864373 - 2⁹ = 648863861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648864323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324432186 + 324432187.

It is an arithmetic number, because the mean of its divisors is an integer number (324432187).

Almost surely, 2^648864373 is an apocalyptic number.

It is an amenable number.

648864373 is a deficient number, since it is larger than the sum of its proper divisors (1).

648864373 is an equidigital number, since it uses as much as digits as its factorization.

648864373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 49.

The square root of 648864373 is about 25472.8163539095. The cubic root of 648864373 is about 865.7343371524.

The spelling of 648864373 in words is "six hundred forty-eight million, eight hundred sixty-four thousand, three hundred seventy-three".