63345521 has 2 divisors, whose sum is σ = 63345522. Its totient is φ = 63345520.

The previous prime is 63345479. The next prime is 63345523. The reversal of 63345521 is 12554336.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58675600 + 4669921 = 7660^2 + 2161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63345521 is a prime.

It is a super-2 number, since 2×63345521² = 8025310061522882, which contains 22 as substring.

Together with 63345523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63345523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31672760 + 31672761.

It is an arithmetic number, because the mean of its divisors is an integer number (31672761).

Almost surely, 2^63345521 is an apocalyptic number.

It is an amenable number.

63345521 is a deficient number, since it is larger than the sum of its proper divisors (1).

63345521 is an equidigital number, since it uses as much as digits as its factorization.

63345521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The square root of 63345521 is about 7958.9899484796. The cubic root of 63345521 is about 398.6318276802.

Adding to 63345521 its reverse (12554336), we get a palindrome (75899857).

The spelling of 63345521 in words is "sixty-three million, three hundred forty-five thousand, five hundred twenty-one".