1666652121 has 12 divisors (see below), whose sum is σ = 2413743280. Its totient is φ = 1108167480.

The previous prime is 1666652047. The next prime is 1666652147. The reversal of 1666652121 is 1212566661.

It is not a de Polignac number, because 1666652121 - 2¹³ = 1666643929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666652191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240895 + ... + 247716.

Almost surely, 2^1666652121 is an apocalyptic number.

It is an amenable number.

1666652121 is a deficient number, since it is larger than the sum of its proper divisors (747091159).

1666652121 is a wasteful number, since it uses less digits than its factorization.

1666652121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488996 (or 488993 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1666652121 is about 40824.6508986911. The cubic root of 1666652121 is about 1185.6276523277.

The spelling of 1666652121 in words is "one billion, six hundred sixty-six million, six hundred fifty-two thousand, one hundred twenty-one".