1666172212 has 12 divisors (see below), whose sum is σ = 2950932096. Its totient is φ = 823048760.

The previous prime is 1666172161. The next prime is 1666172251. The reversal of 1666172212 is 2122716661.

It is a super-2 number, since 2×1666172212² = 5552259680081945888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2508964 + ... + 2509627.

It is an arithmetic number, because the mean of its divisors is an integer number (245911008).

Almost surely, 2^1666172212 is an apocalyptic number.

It is an amenable number.

1666172212 is a deficient number, since it is larger than the sum of its proper divisors (1284759884).

1666172212 is a wasteful number, since it uses less digits than its factorization.

1666172212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018678 (or 5018676 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 1666172212 is about 40818.7727889999. The cubic root of 1666172212 is about 1185.5138417338.

Adding to 1666172212 its reverse (2122716661), we get a palindrome (3788888873).

The spelling of 1666172212 in words is "one billion, six hundred sixty-six million, one hundred seventy-two thousand, two hundred twelve".