211906245661 has 8 divisors (see below), whose sum is σ = 231313255200. Its totient is φ = 192523037040.

The previous prime is 211906245647. The next prime is 211906245701. The reversal of 211906245661 is 166542609112.

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 211906245661 - 2²⁵ = 211872691229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211906248661) 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, 5931606 + ... + 5967223.

It is an arithmetic number, because the mean of its divisors is an integer number (28914156900).

Almost surely, 2^211906245661 is an apocalyptic number.

It is an amenable number.

211906245661 is a deficient number, since it is larger than the sum of its proper divisors (19407009539).

211906245661 is a wasteful number, since it uses less digits than its factorization.

211906245661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11900459.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 211906245661 in words is "two hundred eleven billion, nine hundred six million, two hundred forty-five thousand, six hundred sixty-one".