1666412634 has 8 divisors (see below), whose sum is σ = 3332825280. Its totient is φ = 555470876.

The previous prime is 1666412621. The next prime is 1666412647. The reversal of 1666412634 is 4362146661.

It is an interprime number because it is at equal distance from previous prime (1666412621) and next prime (1666412647).

It is a sphenic number, since it is the product of 3 distinct primes.

1666412634 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1666412592 and 1666412601.

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, 138867714 + ... + 138867725.

It is an arithmetic number, because the mean of its divisors is an integer number (416603160).

Almost surely, 2^1666412634 is an apocalyptic number.

1666412634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666412634 is a wasteful number, since it uses less digits than its factorization.

1666412634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277735444.

The product of its digits is 124416, while the sum is 39.

The square root of 1666412634 is about 40821.7176757667. The cubic root of 1666412634 is about 1185.5708606299.

The spelling of 1666412634 in words is "one billion, six hundred sixty-six million, four hundred twelve thousand, six hundred thirty-four".