1659172211 has 4 divisors (see below), whose sum is σ = 1665628392. Its totient is φ = 1652716032.

The previous prime is 1659172201. The next prime is 1659172213. The reversal of 1659172211 is 1122719561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1659172211 - 2¹⁰ = 1659171187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1659172213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3227705 + ... + 3228218.

It is an arithmetic number, because the mean of its divisors is an integer number (416407098).

Almost surely, 2^1659172211 is an apocalyptic number.

1659172211 is a deficient number, since it is larger than the sum of its proper divisors (6456181).

1659172211 is an equidigital number, since it uses as much as digits as its factorization.

1659172211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456180.

The product of its digits is 7560, while the sum is 35.

The square root of 1659172211 is about 40732.9376672000. The cubic root of 1659172211 is about 1183.8512991495.

The spelling of 1659172211 in words is "one billion, six hundred fifty-nine million, one hundred seventy-two thousand, two hundred eleven".