61611565605 has 16 divisors (see below), whose sum is σ = 101977764480. Its totient is φ = 31726415168.

The previous prime is 61611565571. The next prime is 61611565607. The reversal of 61611565605 is 50656511616.

It is a cyclic number.

It is not a de Polignac number, because 61611565605 - 2⁸ = 61611565349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611565607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70817457 + ... + 70818326.

It is an arithmetic number, because the mean of its divisors is an integer number (6373610280).

Almost surely, 2^61611565605 is an apocalyptic number.

It is an amenable number.

61611565605 is a deficient number, since it is larger than the sum of its proper divisors (40366198875).

61611565605 is a wasteful number, since it uses less digits than its factorization.

61611565605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141635820.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 61611565605 in words is "sixty-one billion, six hundred eleven million, five hundred sixty-five thousand, six hundred five".