1666616212 has 6 divisors (see below), whose sum is σ = 2916578378. Its totient is φ = 833308104.

The previous prime is 1666616209. The next prime is 1666616249. The reversal of 1666616212 is 2126166661.

It can be written as a sum of positive squares in only one way, i.e., 988222096 + 678394116 = 31436^2 + 26046^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208327023 + ... + 208327030.

Almost surely, 2^1666616212 is an apocalyptic number.

It is an amenable number.

1666616212 is a deficient number, since it is larger than the sum of its proper divisors (1249962166).

1666616212 is a wasteful number, since it uses less digits than its factorization.

1666616212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416654057 (or 416654055 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 1666616212 is about 40824.2111007672. The cubic root of 1666616212 is about 1185.6191372516.

The spelling of 1666616212 in words is "one billion, six hundred sixty-six million, six hundred sixteen thousand, two hundred twelve".