210005554119961 has 2 divisors, whose sum is σ = 210005554119962. Its totient is φ = 210005554119960.

The previous prime is 210005554119947. The next prime is 210005554120013. The reversal of 210005554119961 is 169911455500012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128822931300361 + 81182622819600 = 11350019^2 + 9010140^2 .

It is a cyclic number.

It is not a de Polignac number, because 210005554119961 - 2⁴¹ = 207806530864409 is a prime.

It is a super-2 number, since 2×210005554119961² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210005554119941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105002777059980 + 105002777059981.

It is an arithmetic number, because the mean of its divisors is an integer number (105002777059981).

Almost surely, 2^{210005554119961} is an apocalyptic number.

It is an amenable number.

210005554119961 is a deficient number, since it is larger than the sum of its proper divisors (1).

210005554119961 is an equidigital number, since it uses as much as digits as its factorization.

210005554119961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486000, while the sum is 49.

The spelling of 210005554119961 in words is "two hundred ten trillion, five billion, five hundred fifty-four million, one hundred nineteen thousand, nine hundred sixty-one".