1666358190 has 384 divisors, whose sum is σ = 5673369600. Its totient is φ = 345461760.

The previous prime is 1666358153. The next prime is 1666358201. The reversal of 1666358190 is 918536661.

It is a super-2 number, since 2×1666358190² = 5553499234760152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

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 191 ways as a sum of consecutive naturals, for example, 6972091 + ... + 6972329.

It is an arithmetic number, because the mean of its divisors is an integer number (14774400).

Almost surely, 2^1666358190 is an apocalyptic number.

1666358190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666358190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2836684800).

1666358190 is an abundant number, since it is smaller than the sum of its proper divisors (4007011410).

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

1666358190 is a wasteful number, since it uses less digits than its factorization.

1666358190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1666358190 is about 40821.0508193995. The cubic root of 1666358190 is about 1185.5579490773.

The spelling of 1666358190 in words is "one billion, six hundred sixty-six million, three hundred fifty-eight thousand, one hundred ninety".