6613810561 has 4 divisors (see below), whose sum is σ = 6672339972. Its totient is φ = 6555281152.

The previous prime is 6613810547. The next prime is 6613810579. The reversal of 6613810561 is 1650183166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1985593600 + 4628216961 = 44560^2 + 68031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6613810561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6613810561.

It is not an unprimeable number, because it can be changed into a prime (6613010561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29264536 + ... + 29264761.

It is an arithmetic number, because the mean of its divisors is an integer number (1668084993).

Almost surely, 2^6613810561 is an apocalyptic number.

It is an amenable number.

6613810561 is a deficient number, since it is larger than the sum of its proper divisors (58529411).

6613810561 is a wasteful number, since it uses less digits than its factorization.

6613810561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58529410.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 6613810561 is about 81325.3377552162. The cubic root of 6613810561 is about 1877.0849043948.

The spelling of 6613810561 in words is "six billion, six hundred thirteen million, eight hundred ten thousand, five hundred sixty-one".