63613435421 has 2 divisors, whose sum is σ = 63613435422. Its totient is φ = 63613435420.

The previous prime is 63613435381. The next prime is 63613435423. The reversal of 63613435421 is 12453431636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51979440100 + 11633995321 = 227990^2 + 107861^2 .

It is a cyclic number.

It is not a de Polignac number, because 63613435421 - 2⁶ = 63613435357 is a prime.

Together with 63613435423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63613435423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31806717710 + 31806717711.

It is an arithmetic number, because the mean of its divisors is an integer number (31806717711).

Almost surely, 2^63613435421 is an apocalyptic number.

It is an amenable number.

63613435421 is a deficient number, since it is larger than the sum of its proper divisors (1).

63613435421 is an equidigital number, since it uses as much as digits as its factorization.

63613435421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 38.

The spelling of 63613435421 in words is "sixty-three billion, six hundred thirteen million, four hundred thirty-five thousand, four hundred twenty-one".