61565561041 has 2 divisors, whose sum is σ = 61565561042. Its totient is φ = 61565561040.

The previous prime is 61565561017. The next prime is 61565561069. The reversal of 61565561041 is 14016556516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42904908225 + 18660652816 = 207135^2 + 136604^2 .

It is a cyclic number.

It is not a de Polignac number, because 61565561041 - 2⁷ = 61565560913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61565560985 and 61565561003.

It is not a weakly prime, because it can be changed into another prime (61565361041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782780520 + 30782780521.

It is an arithmetic number, because the mean of its divisors is an integer number (30782780521).

Almost surely, 2^61565561041 is an apocalyptic number.

It is an amenable number.

61565561041 is a deficient number, since it is larger than the sum of its proper divisors (1).

61565561041 is an equidigital number, since it uses as much as digits as its factorization.

61565561041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 61565561041 in words is "sixty-one billion, five hundred sixty-five million, five hundred sixty-one thousand, forty-one".