421561541633 has 2 divisors, whose sum is σ = 421561541634. Its totient is φ = 421561541632.

The previous prime is 421561541629. The next prime is 421561541651. The reversal of 421561541633 is 336145165124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318961764289 + 102599777344 = 564767^2 + 320312^2 .

It is a cyclic number.

It is not a de Polignac number, because 421561541633 - 2² = 421561541629 is a prime.

It is not a weakly prime, because it can be changed into another prime (421561541683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210780770816 + 210780770817.

It is an arithmetic number, because the mean of its divisors is an integer number (210780770817).

Almost surely, 2^421561541633 is an apocalyptic number.

It is an amenable number.

421561541633 is a deficient number, since it is larger than the sum of its proper divisors (1).

421561541633 is an equidigital number, since it uses as much as digits as its factorization.

421561541633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The spelling of 421561541633 in words is "four hundred twenty-one billion, five hundred sixty-one million, five hundred forty-one thousand, six hundred thirty-three".