6521155056 has 60 divisors (see below), whose sum is σ = 19654042408. Its totient is φ = 2006508672.

The previous prime is 6521155027. The next prime is 6521155057. The reversal of 6521155056 is 6505511256.

6521155056 is a `hidden beast` number, since 6 + 52 + 1 + 1 + 550 + 56 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6521155056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521155057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1739890 + ... + 1743633.

Almost surely, 2^6521155056 is an apocalyptic number.

It is an amenable number.

6521155056 is an abundant number, since it is smaller than the sum of its proper divisors (13132887352).

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

6521155056 is a wasteful number, since it uses less digits than its factorization.

6521155056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483550 (or 3483541 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 6521155056 is about 80753.6689940463. The cubic root of 6521155056 is about 1868.2780392749.

The spelling of 6521155056 in words is "six billion, five hundred twenty-one million, one hundred fifty-five thousand, fifty-six".