6655570005521 has 8 divisors (see below), whose sum is σ = 6781252282920. Its totient is φ = 6529891635072.

The previous prime is 6655570005493. The next prime is 6655570005527. The reversal of 6655570005521 is 1255000755566.

It can be written as a sum of positive squares in 4 ways, for example, as 739600 + 6655569265921 = 860^2 + 2579839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6655570005521 - 2³⁰ = 6654496263697 is a prime.

It is a super-2 number, since 2×6655570005521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6655570005527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2583875 + ... + 4470743.

It is an arithmetic number, because the mean of its divisors is an integer number (847656535365).

Almost surely, 2^{6655570005521} is an apocalyptic number.

It is an amenable number.

6655570005521 is a deficient number, since it is larger than the sum of its proper divisors (125682277399).

6655570005521 is a wasteful number, since it uses less digits than its factorization.

6655570005521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953475.

The product of its (nonzero) digits is 1575000, while the sum is 47.

The spelling of 6655570005521 in words is "six trillion, six hundred fifty-five billion, five hundred seventy million, five thousand, five hundred twenty-one".