211686034645 has 8 divisors (see below), whose sum is σ = 268965785304. Its totient is φ = 159387131904.

The previous prime is 211686034631. The next prime is 211686034663. The reversal of 211686034645 is 546430686112.

It can be written as a sum of positive squares in 4 ways, for example, as 46387682884 + 165298351761 = 215378^2 + 406569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211686034645 - 2¹⁷ = 211685903573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211686034595 and 211686034604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245211884 + ... + 1245212053.

It is an arithmetic number, because the mean of its divisors is an integer number (33620723163).

Almost surely, 2^211686034645 is an apocalyptic number.

It is an amenable number.

211686034645 is a deficient number, since it is larger than the sum of its proper divisors (57279750659).

211686034645 is a wasteful number, since it uses less digits than its factorization.

211686034645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490423959.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 211686034645 in words is "two hundred eleven billion, six hundred eighty-six million, thirty-four thousand, six hundred forty-five".