61843535849 has 2 divisors, whose sum is σ = 61843535850. Its totient is φ = 61843535848.

The previous prime is 61843535837. The next prime is 61843535869. The reversal of 61843535849 is 94853534816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55905292249 + 5938243600 = 236443^2 + 77060^2 .

It is a cyclic number.

It is not a de Polignac number, because 61843535849 - 2¹⁶ = 61843470313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61843535794 and 61843535803.

It is not a weakly prime, because it can be changed into another prime (61843535869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921767924 + 30921767925.

It is an arithmetic number, because the mean of its divisors is an integer number (30921767925).

Almost surely, 2^61843535849 is an apocalyptic number.

It is an amenable number.

61843535849 is a deficient number, since it is larger than the sum of its proper divisors (1).

61843535849 is an equidigital number, since it uses as much as digits as its factorization.

61843535849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12441600, while the sum is 56.

The spelling of 61843535849 in words is "sixty-one billion, eight hundred forty-three million, five hundred thirty-five thousand, eight hundred forty-nine".