1666154004 has 96 divisors (see below), whose sum is σ = 4198884480. Its totient is φ = 512598528.

The previous prime is 1666153997. The next prime is 1666154011. The reversal of 1666154004 is 4004516661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666153997) and next prime (1666154011).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2090134 + ... + 2090930.

It is an arithmetic number, because the mean of its divisors is an integer number (43738380).

Almost surely, 2^1666154004 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 1666154004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2099442240).

1666154004 is an abundant number, since it is smaller than the sum of its proper divisors (2532730476).

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

1666154004 is a wasteful number, since it uses less digits than its factorization.

1666154004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1666154004 is about 40818.5497537578. The cubic root of 1666154004 is about 1185.5095232697.

The spelling of 1666154004 in words is "one billion, six hundred sixty-six million, one hundred fifty-four thousand, four".