61005550211 has 4 divisors (see below), whose sum is σ = 61006409424. Its totient is φ = 61004691000.

The previous prime is 61005550157. The next prime is 61005550231. The reversal of 61005550211 is 11205550016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61005550211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61005550231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312455 + ... + 468656.

It is an arithmetic number, because the mean of its divisors is an integer number (15251602356).

Almost surely, 2^61005550211 is an apocalyptic number.

61005550211 is a deficient number, since it is larger than the sum of its proper divisors (859213).

61005550211 is an equidigital number, since it uses as much as digits as its factorization.

61005550211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859212.

The product of its (nonzero) digits is 1500, while the sum is 26.

The spelling of 61005550211 in words is "sixty-one billion, five million, five hundred fifty thousand, two hundred eleven".