6521622552 has 96 divisors (see below), whose sum is σ = 19244110800. Its totient is φ = 2045979648.

The previous prime is 6521622451. The next prime is 6521622559. The reversal of 6521622552 is 2552261256.

6521622552 is a `hidden beast` number, since 6 + 5 + 21 + 622 + 5 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521622559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10188 + ... + 114660.

Almost surely, 2^6521622552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6521622552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9622055400).

6521622552 is an abundant number, since it is smaller than the sum of its proper divisors (12722488248).

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

6521622552 is a wasteful number, since it uses less digits than its factorization.

6521622552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104522 (or 104495 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 6521622552 is about 80756.5635227255. The cubic root of 6521622552 is about 1868.3226832903.

The spelling of 6521622552 in words is "six billion, five hundred twenty-one million, six hundred twenty-two thousand, five hundred fifty-two".