1666412624 has 40 divisors (see below), whose sum is σ = 3426733800. Its totient is φ = 782327808.

The previous prime is 1666412621. The next prime is 1666412647. The reversal of 1666412624 is 4262146661.

It can be written as a sum of positive squares in 4 ways, for example, as 507691024 + 1158721600 = 22532^2 + 34040^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666412621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110702 + ... + 124850.

It is an arithmetic number, because the mean of its divisors is an integer number (85668345).

Almost surely, 2^1666412624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666412624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1713366900).

1666412624 is an abundant number, since it is smaller than the sum of its proper divisors (1760321176).

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

1666412624 is a wasteful number, since it uses less digits than its factorization.

1666412624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14607 (or 14601 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 1666412624 is about 40821.7175532828. The cubic root of 1666412624 is about 1185.5708582584.

The spelling of 1666412624 in words is "one billion, six hundred sixty-six million, four hundred twelve thousand, six hundred twenty-four".