61740865321 has 2 divisors, whose sum is σ = 61740865322. Its totient is φ = 61740865320.

The previous prime is 61740865289. The next prime is 61740865343. The reversal of 61740865321 is 12356804716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55790440000 + 5950425321 = 236200^2 + 77139^2 .

It is a cyclic number.

It is not a de Polignac number, because 61740865321 - 2⁵ = 61740865289 is a prime.

It is not a weakly prime, because it can be changed into another prime (61740865621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30870432660 + 30870432661.

It is an arithmetic number, because the mean of its divisors is an integer number (30870432661).

Almost surely, 2^61740865321 is an apocalyptic number.

It is an amenable number.

61740865321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61740865321 is an equidigital number, since it uses as much as digits as its factorization.

61740865321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 61740865321 in words is "sixty-one billion, seven hundred forty million, eight hundred sixty-five thousand, three hundred twenty-one".