211641661705 has 8 divisors (see below), whose sum is σ = 253989338112. Its totient is φ = 169300433328.

The previous prime is 211641661703. The next prime is 211641661723. The reversal of 211641661705 is 507166146112.

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 211641661705 - 2¹ = 211641661703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211641661703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1539499 + ... + 1671328.

It is an arithmetic number, because the mean of its divisors is an integer number (31748667264).

Almost surely, 2^211641661705 is an apocalyptic number.

It is an amenable number.

211641661705 is a deficient number, since it is larger than the sum of its proper divisors (42347676407).

211641661705 is a wasteful number, since it uses less digits than its factorization.

211641661705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224015.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 211641661705 in words is "two hundred eleven billion, six hundred forty-one million, six hundred sixty-one thousand, seven hundred five".