421563448477 has 2 divisors, whose sum is σ = 421563448478. Its totient is φ = 421563448476.

The previous prime is 421563448469. The next prime is 421563448513. The reversal of 421563448477 is 774844365124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395717741721 + 25845706756 = 629061^2 + 160766^2 .

It is a cyclic number.

It is not a de Polignac number, because 421563448477 - 2³ = 421563448469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421563448417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210781724238 + 210781724239.

It is an arithmetic number, because the mean of its divisors is an integer number (210781724239).

Almost surely, 2^421563448477 is an apocalyptic number.

It is an amenable number.

421563448477 is a deficient number, since it is larger than the sum of its proper divisors (1).

421563448477 is an equidigital number, since it uses as much as digits as its factorization.

421563448477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18063360, while the sum is 55.

The spelling of 421563448477 in words is "four hundred twenty-one billion, five hundred sixty-three million, four hundred forty-eight thousand, four hundred seventy-seven".