211665042425 has 6 divisors (see below), whose sum is σ = 262464652638. Its totient is φ = 169332033920.

The previous prime is 211665042401. The next prime is 211665042437. The reversal of 211665042425 is 524240566112.

211665042425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2599368256 + 209065674169 = 50984^2 + 457237^2 .

It is not a de Polignac number, because 211665042425 - 2¹⁸ = 211664780281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4233300824 + ... + 4233300873.

It is an arithmetic number, because the mean of its divisors is an integer number (43744108773).

Almost surely, 2^211665042425 is an apocalyptic number.

211665042425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211665042425 is a deficient number, since it is larger than the sum of its proper divisors (50799610213).

211665042425 is an equidigital number, since it uses as much as digits as its factorization.

211665042425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8466601707 (or 8466601702 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 211665042425 in words is "two hundred eleven billion, six hundred sixty-five million, forty-two thousand, four hundred twenty-five".