6561246653 has 8 divisors (see below), whose sum is σ = 7085979768. Its totient is φ = 6039373824.

The previous prime is 6561246641. The next prime is 6561246691. The reversal of 6561246653 is 3566421656.

It can be written as a sum of positive squares in 4 ways, for example, as 461949049 + 6099297604 = 21493^2 + 78098^2 .

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 6561246653 - 2⁸ = 6561246397 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 (6561246053) 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, 710300 + ... + 719477.

It is an arithmetic number, because the mean of its divisors is an integer number (885747471).

Almost surely, 2^6561246653 is an apocalyptic number.

It is an amenable number.

6561246653 is a deficient number, since it is larger than the sum of its proper divisors (524733115).

6561246653 is a wasteful number, since it uses less digits than its factorization.

6561246653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430143.

The product of its digits is 777600, while the sum is 44.

The square root of 6561246653 is about 81001.5225350734. The cubic root of 6561246653 is about 1872.0988999367.

The spelling of 6561246653 in words is "six billion, five hundred sixty-one million, two hundred forty-six thousand, six hundred fifty-three".