6556036561 has 8 divisors (see below), whose sum is σ = 6573326760. Its totient is φ = 6538764672.

The previous prime is 6556036537. The next prime is 6556036573. The reversal of 6556036561 is 1656306556.

It can be written as a sum of positive squares in 4 ways, for example, as 5346388161 + 1209648400 = 73119^2 + 34780^2 .

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 6556036561 - 2¹⁵ = 6556003793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556036261) 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, 970351 + ... + 977083.

It is an arithmetic number, because the mean of its divisors is an integer number (821665845).

Almost surely, 2^6556036561 is an apocalyptic number.

It is an amenable number.

6556036561 is a deficient number, since it is larger than the sum of its proper divisors (17290199).

6556036561 is a wasteful number, since it uses less digits than its factorization.

6556036561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 6556036561 is about 80969.3556909032. The cubic root of 6556036561 is about 1871.6032425872.

The spelling of 6556036561 in words is "six billion, five hundred fifty-six million, thirty-six thousand, five hundred sixty-one".