211550660505 has 48 divisors (see below), whose sum is σ = 379956335616. Its totient is φ = 108772087680.

The previous prime is 211550660459. The next prime is 211550660509. The reversal of 211550660505 is 505066055112.

211550660505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211550660505 - 2¹⁴ = 211550644121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211550660505.

It is not an unprimeable number, because it can be changed into a prime (211550660509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78579 + ... + 655191.

It is an arithmetic number, because the mean of its divisors is an integer number (7915756992).

Almost surely, 2^211550660505 is an apocalyptic number.

It is an amenable number.

211550660505 is a deficient number, since it is larger than the sum of its proper divisors (168405675111).

211550660505 is a wasteful number, since it uses less digits than its factorization.

211550660505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576918 (or 576915 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 211550660505 in words is "two hundred eleven billion, five hundred fifty million, six hundred sixty thousand, five hundred five".