61115565 has 32 divisors (see below), whose sum is σ = 112859136. Its totient is φ = 27662400.

The previous prime is 61115521. The next prime is 61115567. The reversal of 61115565 is 56551116.

61115565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61115565 - 2⁹ = 61115053 is a prime.

It is a super-2 number, since 2×61115565² = 7470224570538450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61115567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7990 + ... + 13640.

It is an arithmetic number, because the mean of its divisors is an integer number (3526848).

Almost surely, 2^61115565 is an apocalyptic number.

It is an amenable number.

61115565 is a deficient number, since it is larger than the sum of its proper divisors (51743571).

61115565 is a wasteful number, since it uses less digits than its factorization.

61115565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769.

The product of its digits is 4500, while the sum is 30.

The square root of 61115565 is about 7817.6444662059. The cubic root of 61115565 is about 393.8981523621.

The spelling of 61115565 in words is "sixty-one million, one hundred fifteen thousand, five hundred sixty-five".