1666745122211 has 8 divisors (see below), whose sum is σ = 1796714337264. Its totient is φ = 1537027057440.

The previous prime is 1666745122201. The next prime is 1666745122283. The reversal of 1666745122211 is 1122215476661.

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 1666745122211 - 2³⁴ = 1649565253027 is a prime.

It is a super-2 number, since 2×1666745122211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666745122201) 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, 62773781 + ... + 62800326.

It is an arithmetic number, because the mean of its divisors is an integer number (224589292158).

Almost surely, 2^{1666745122211} is an apocalyptic number.

1666745122211 is a deficient number, since it is larger than the sum of its proper divisors (129969215053).

1666745122211 is a wasteful number, since it uses less digits than its factorization.

1666745122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125575141.

The product of its digits is 241920, while the sum is 44.

The spelling of 1666745122211 in words is "one trillion, six hundred sixty-six billion, seven hundred forty-five million, one hundred twenty-two thousand, two hundred eleven".