1668165156 has 144 divisors (see below), whose sum is σ = 4898624640. Its totient is φ = 468840960.

The previous prime is 1668165133. The next prime is 1668165157. The reversal of 1668165156 is 6515618661.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1668165157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7284450 + ... + 7284678.

Almost surely, 2^1668165156 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 1668165156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2449312320).

1668165156 is an abundant number, since it is smaller than the sum of its proper divisors (3230459484).

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

1668165156 is a wasteful number, since it uses less digits than its factorization.

1668165156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 589 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1668165156 is about 40843.1775943058. The cubic root of 1668165156 is about 1185.9863261696.

The spelling of 1668165156 in words is "one billion, six hundred sixty-eight million, one hundred sixty-five thousand, one hundred fifty-six".