61218818105663 has 2 divisors, whose sum is σ = 61218818105664. Its totient is φ = 61218818105662.

The previous prime is 61218818105609. The next prime is 61218818105729. The reversal of 61218818105663 is 36650181881216.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61218818105663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61218818105599 and 61218818105608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61218818105063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30609409052831 + 30609409052832.

It is an arithmetic number, because the mean of its divisors is an integer number (30609409052832).

Almost surely, 2^{61218818105663} is an apocalyptic number.

61218818105663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61218818105663 is an equidigital number, since it uses as much as digits as its factorization.

61218818105663 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.

Adding to 61218818105663 its reverse (36650181881216), we get a palindrome (97868999986879).

The spelling of 61218818105663 in words is "sixty-one trillion, two hundred eighteen billion, eight hundred eighteen million, one hundred five thousand, six hundred sixty-three".