6523521630 has 64 divisors (see below), whose sum is σ = 15976839168. Its totient is φ = 1704326400.

The previous prime is 6523521607. The next prime is 6523521649. The reversal of 6523521630 is 361253256.

It is a junction number, because it is equal to n+sod(n) for n = 6523521591 and 6523521600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320827 + ... + 340553.

It is an arithmetic number, because the mean of its divisors is an integer number (249638112).

Almost surely, 2^6523521630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6523521630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7988419584).

6523521630 is an abundant number, since it is smaller than the sum of its proper divisors (9453317538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6523521630 is a wasteful number, since it uses less digits than its factorization.

6523521630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19961.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 6523521630 is about 80768.3207080598. The cubic root of 6523521630 is about 1868.5040157800.

Adding to 6523521630 its reverse (361253256), we get a palindrome (6884774886).

The spelling of 6523521630 in words is "six billion, five hundred twenty-three million, five hundred twenty-one thousand, six hundred thirty".