5555555554961 has 2 divisors, whose sum is σ = 5555555554962. Its totient is φ = 5555555554960.

The previous prime is 5555555554949. The next prime is 5555555554993. The reversal of 5555555554961 is 1694555555555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3962548078225 + 1593007476736 = 1990615^2 + 1262144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5555555554961 is a prime.

It is not a weakly prime, because it can be changed into another prime (5555555554931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777777777480 + 2777777777481.

It is an arithmetic number, because the mean of its divisors is an integer number (2777777777481).

Almost surely, 2^{5555555554961} is an apocalyptic number.

It is an amenable number.

5555555554961 is a deficient number, since it is larger than the sum of its proper divisors (1).

5555555554961 is an equidigital number, since it uses as much as digits as its factorization.

5555555554961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 421875000, while the sum is 65.

The spelling of 5555555554961 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-four thousand, nine hundred sixty-one".