63648028421 has 2 divisors, whose sum is σ = 63648028422. Its totient is φ = 63648028420.

The previous prime is 63648028387. The next prime is 63648028439. The reversal of 63648028421 is 12482084636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62419525921 + 1228502500 = 249839^2 + 35050^2 .

It is a cyclic number.

It is not a de Polignac number, because 63648028421 - 2²⁶ = 63580919557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63648024421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31824014210 + 31824014211.

It is an arithmetic number, because the mean of its divisors is an integer number (31824014211).

Almost surely, 2^63648028421 is an apocalyptic number.

It is an amenable number.

63648028421 is a deficient number, since it is larger than the sum of its proper divisors (1).

63648028421 is an equidigital number, since it uses as much as digits as its factorization.

63648028421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 63648028421 in words is "sixty-three billion, six hundred forty-eight million, twenty-eight thousand, four hundred twenty-one".