61005388889 has 2 divisors, whose sum is σ = 61005388890. Its totient is φ = 61005388888.

The previous prime is 61005388783. The next prime is 61005388891. The reversal of 61005388889 is 98888350016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52014556489 + 8990832400 = 228067^2 + 94820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61005388889 is a prime.

Together with 61005388891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61005388489) 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, 30502694444 + 30502694445.

It is an arithmetic number, because the mean of its divisors is an integer number (30502694445).

Almost surely, 2^61005388889 is an apocalyptic number.

It is an amenable number.

61005388889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61005388889 is an equidigital number, since it uses as much as digits as its factorization.

61005388889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 61005388889 in words is "sixty-one billion, five million, three hundred eighty-eight thousand, eight hundred eighty-nine".