6561600551 has 8 divisors (see below), whose sum is σ = 7579175184. Its totient is φ = 5614203520.

The previous prime is 6561600527. The next prime is 6561600553. The reversal of 6561600551 is 1550061656.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6561600551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561600553) 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, 17544200 + ... + 17544573.

It is an arithmetic number, because the mean of its divisors is an integer number (947396898).

Almost surely, 2^6561600551 is an apocalyptic number.

6561600551 is a deficient number, since it is larger than the sum of its proper divisors (1017574633).

6561600551 is a wasteful number, since it uses less digits than its factorization.

6561600551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35088801.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 6561600551 is about 81003.7070201111. The cubic root of 6561600551 is about 1872.1325581819.

It can be divided in two parts, 65 and 61600551, that added together give a palindrome (61600616).

The spelling of 6561600551 in words is "six billion, five hundred sixty-one million, six hundred thousand, five hundred fifty-one".