61109755204789 has 2 divisors, whose sum is σ = 61109755204790. Its totient is φ = 61109755204788.

The previous prime is 61109755204777. The next prime is 61109755204811. The reversal of 61109755204789 is 98740255790116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60567150600100 + 542604604689 = 7782490^2 + 736617^2 .

It is a cyclic number.

It is not a de Polignac number, because 61109755204789 - 2¹³ = 61109755196597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61109755204789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61109755004789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554877602394 + 30554877602395.

It is an arithmetic number, because the mean of its divisors is an integer number (30554877602395).

Almost surely, 2^{61109755204789} is an apocalyptic number.

It is an amenable number.

61109755204789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61109755204789 is an equidigital number, since it uses as much as digits as its factorization.

61109755204789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38102400, while the sum is 64.

The spelling of 61109755204789 in words is "sixty-one trillion, one hundred nine billion, seven hundred fifty-five million, two hundred four thousand, seven hundred eighty-nine".