6463525130221 has 4 divisors (see below), whose sum is σ = 6530159410012. Its totient is φ = 6396890850432.

The previous prime is 6463525130197. The next prime is 6463525130261. The reversal of 6463525130221 is 1220315253646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1186117028100 + 5277408102121 = 1089090^2 + 2297261^2 .

It is a cyclic number.

It is not a de Polignac number, because 6463525130221 - 2²¹ = 6463523033069 is a prime.

It is a super-3 number, since 3×6463525130221³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6463525130261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33317139750 + ... + 33317139943.

It is an arithmetic number, because the mean of its divisors is an integer number (1632539852503).

Almost surely, 2^{6463525130221} is an apocalyptic number.

It is an amenable number.

6463525130221 is a deficient number, since it is larger than the sum of its proper divisors (66634279791).

6463525130221 is an equidigital number, since it uses as much as digits as its factorization.

6463525130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66634279790.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 6463525130221 in words is "six trillion, four hundred sixty-three billion, five hundred twenty-five million, one hundred thirty thousand, two hundred twenty-one".