20665567211 has 8 divisors (see below), whose sum is σ = 20822156544. Its totient is φ = 20509237800.

The previous prime is 20665567147. The next prime is 20665567213. The reversal of 20665567211 is 11276556602.

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 20665567211 - 2⁶ = 20665567147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665567213) 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, 96140 + ... + 224886.

It is an arithmetic number, because the mean of its divisors is an integer number (2602769568).

Almost surely, 2^20665567211 is an apocalyptic number.

20665567211 is a deficient number, since it is larger than the sum of its proper divisors (156589333).

20665567211 is a wasteful number, since it uses less digits than its factorization.

20665567211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129961.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 20665567211 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, two hundred eleven".