61665606593 has 2 divisors, whose sum is σ = 61665606594. Its totient is φ = 61665606592.

The previous prime is 61665606571. The next prime is 61665606599. The reversal of 61665606593 is 39560656616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52645925809 + 9019680784 = 229447^2 + 94972^2 .

It is a cyclic number.

It is not a de Polignac number, because 61665606593 - 2¹⁰ = 61665605569 is a prime.

It is not a weakly prime, because it can be changed into another prime (61665606599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30832803296 + 30832803297.

It is an arithmetic number, because the mean of its divisors is an integer number (30832803297).

Almost surely, 2^61665606593 is an apocalyptic number.

It is an amenable number.

61665606593 is a deficient number, since it is larger than the sum of its proper divisors (1).

61665606593 is an equidigital number, since it uses as much as digits as its factorization.

61665606593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 53.

The spelling of 61665606593 in words is "sixty-one billion, six hundred sixty-five million, six hundred six thousand, five hundred ninety-three".