61565561049 has 16 divisors (see below), whose sum is σ = 85697092800. Its totient is φ = 39264837696.

The previous prime is 61565561041. The next prime is 61565561069. The reversal of 61565561049 is 94016556516.

It is not a de Polignac number, because 61565561049 - 2³ = 61565561041 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61565560989 and 61565561007.

It is not an unprimeable number, because it can be changed into a prime (61565561041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3236619 + ... + 3255584.

It is an arithmetic number, because the mean of its divisors is an integer number (5356068300).

Almost surely, 2^61565561049 is an apocalyptic number.

It is an amenable number.

61565561049 is a deficient number, since it is larger than the sum of its proper divisors (24131531751).

61565561049 is a wasteful number, since it uses less digits than its factorization.

61565561049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492344.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 61565561049 in words is "sixty-one billion, five hundred sixty-five million, five hundred sixty-one thousand, forty-nine".