55218086369 has 2 divisors, whose sum is σ = 55218086370. Its totient is φ = 55218086368.

The previous prime is 55218086309. The next prime is 55218086389. The reversal of 55218086369 is 96368081255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50709635344 + 4508451025 = 225188^2 + 67145^2 .

It is a cyclic number.

It is not a de Polignac number, because 55218086369 - 2¹² = 55218082273 is a prime.

It is a super-2 number, since 2×55218086369² (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 55218086369.

It is not a weakly prime, because it can be changed into another prime (55218086309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27609043184 + 27609043185.

It is an arithmetic number, because the mean of its divisors is an integer number (27609043185).

Almost surely, 2^55218086369 is an apocalyptic number.

It is an amenable number.

55218086369 is a deficient number, since it is larger than the sum of its proper divisors (1).

55218086369 is an equidigital number, since it uses as much as digits as its factorization.

55218086369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 55218086369 in words is "fifty-five billion, two hundred eighteen million, eighty-six thousand, three hundred sixty-nine".