6115506561 has 20 divisors (see below), whose sum is σ = 9149410644. Its totient is φ = 4070800800.

The previous prime is 6115506541. The next prime is 6115506571. The reversal of 6115506561 is 1656055116.

It can be written as a sum of positive squares in 2 ways, for example, as 4083210000 + 2032296561 = 63900^2 + 45081^2 .

It is not a de Polignac number, because 6115506561 - 2⁹ = 6115506049 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6115506541) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3570 + ... + 110651.

Almost surely, 2^6115506561 is an apocalyptic number.

It is an amenable number.

6115506561 is a deficient number, since it is larger than the sum of its proper divisors (3033904083).

6115506561 is a wasteful number, since it uses less digits than its factorization.

6115506561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114894 (or 114885 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 6115506561 is about 78201.7043356473. The cubic root of 6115506561 is about 1828.7070765323.

The spelling of 6115506561 in words is "six billion, one hundred fifteen million, five hundred six thousand, five hundred sixty-one".