211065611666 has 32 divisors (see below), whose sum is σ = 389686096128. Its totient is φ = 83492804160.

The previous prime is 211065611633. The next prime is 211065611683. The reversal of 211065611666 is 666116560112.

It is a super-3 number, since 3×211065611666³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3527156 + ... + 3586496.

It is an arithmetic number, because the mean of its divisors is an integer number (12177690504).

Almost surely, 2^211065611666 is an apocalyptic number.

211065611666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

211065611666 is a deficient number, since it is larger than the sum of its proper divisors (178620484462).

211065611666 is a wasteful number, since it uses less digits than its factorization.

211065611666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78906.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 211065611666 in words is "two hundred eleven billion, sixty-five million, six hundred eleven thousand, six hundred sixty-six".