1666818652 has 12 divisors (see below), whose sum is σ = 3088517040. Its totient is φ = 784385216.

The previous prime is 1666818641. The next prime is 1666818653. The reversal of 1666818652 is 2568186661.

It is a junction number, because it is equal to n+sod(n) for n = 1666818596 and 1666818605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666818653) 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, 12255952 + ... + 12256087.

It is an arithmetic number, because the mean of its divisors is an integer number (257376420).

Almost surely, 2^1666818652 is an apocalyptic number.

It is an amenable number.

1666818652 is a deficient number, since it is larger than the sum of its proper divisors (1421698388).

1666818652 is a wasteful number, since it uses less digits than its factorization.

1666818652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24512060 (or 24512058 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 1666818652 is about 40826.6904365269. The cubic root of 1666818652 is about 1185.6671401089.

The spelling of 1666818652 in words is "one billion, six hundred sixty-six million, eight hundred eighteen thousand, six hundred fifty-two".