421553107591559 has 2 divisors, whose sum is σ = 421553107591560. Its totient is φ = 421553107591558.

The previous prime is 421553107591541. The next prime is 421553107591643. The reversal of 421553107591559 is 955195701355124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421553107591559 - 2⁴⁴ = 403960921547143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421553107591519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210776553795779 + 210776553795780.

It is an arithmetic number, because the mean of its divisors is an integer number (210776553795780).

Almost surely, 2^{421553107591559} is an apocalyptic number.

421553107591559 is a deficient number, since it is larger than the sum of its proper divisors (1).

421553107591559 is an equidigital number, since it uses as much as digits as its factorization.

421553107591559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42525000, while the sum is 62.

The spelling of 421553107591559 in words is "four hundred twenty-one trillion, five hundred fifty-three billion, one hundred seven million, five hundred ninety-one thousand, five hundred fifty-nine".