1668351870 has 32 divisors (see below), whose sum is σ = 4448939040. Its totient is φ = 444893760.

The previous prime is 1668351859. The next prime is 1668351871. The reversal of 1668351870 is 781538661.

1668351870 is a `hidden beast` number, since 1 + 6 + 68 + 3 + 518 + 70 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668351871) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3089271 + ... + 3089810.

It is an arithmetic number, because the mean of its divisors is an integer number (139029345).

Almost surely, 2^1668351870 is an apocalyptic number.

1668351870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668351870 is an abundant number, since it is smaller than the sum of its proper divisors (2780587170).

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

1668351870 is a wasteful number, since it uses less digits than its factorization.

1668351870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179097 (or 6179091 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1668351870 is about 40845.4632731715. The cubic root of 1668351870 is about 1186.0305727857.

The spelling of 1668351870 in words is "one billion, six hundred sixty-eight million, three hundred fifty-one thousand, eight hundred seventy".