163552510421 has 2 divisors, whose sum is σ = 163552510422. Its totient is φ = 163552510420.

The previous prime is 163552510417. The next prime is 163552510463. The reversal of 163552510421 is 124015255361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110898324196 + 52654186225 = 333014^2 + 229465^2 .

It is a cyclic number.

It is not a de Polignac number, because 163552510421 - 2² = 163552510417 is a prime.

It is a super-2 number, since 2×163552510421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163552510621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81776255210 + 81776255211.

It is an arithmetic number, because the mean of its divisors is an integer number (81776255211).

Almost surely, 2^163552510421 is an apocalyptic number.

It is an amenable number.

163552510421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163552510421 is an equidigital number, since it uses as much as digits as its factorization.

163552510421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 163552510421 its reverse (124015255361), we get a palindrome (287567765782).

The spelling of 163552510421 in words is "one hundred sixty-three billion, five hundred fifty-two million, five hundred ten thousand, four hundred twenty-one".