61785007243 has 2 divisors, whose sum is σ = 61785007244. Its totient is φ = 61785007242.

The previous prime is 61785007127. The next prime is 61785007259. The reversal of 61785007243 is 34270058716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61785007243 - 2²⁹ = 61248136331 is a prime.

It is a super-2 number, since 2×61785007243² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61785007243.

It is not a weakly prime, because it can be changed into another prime (61785007643) 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 as a sum of consecutive naturals, namely, 30892503621 + 30892503622.

It is an arithmetic number, because the mean of its divisors is an integer number (30892503622).

Almost surely, 2^61785007243 is an apocalyptic number.

61785007243 is a deficient number, since it is larger than the sum of its proper divisors (1).

61785007243 is an equidigital number, since it uses as much as digits as its factorization.

61785007243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 61785007243 in words is "sixty-one billion, seven hundred eighty-five million, seven thousand, two hundred forty-three".