1666198156 has 18 divisors (see below), whose sum is σ = 3391903788. Its totient is φ = 714084840.

The previous prime is 1666198129. The next prime is 1666198181. The reversal of 1666198156 is 6518916661.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4250310 + ... + 4250701.

Almost surely, 2^1666198156 is an apocalyptic number.

It is an amenable number.

1666198156 is an abundant number, since it is smaller than the sum of its proper divisors (1725705632).

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

1666198156 is a wasteful number, since it uses less digits than its factorization.

1666198156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501029 (or 8501020 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 1666198156 is about 40819.0905827163. The cubic root of 1666198156 is about 1185.5199949216.

The spelling of 1666198156 in words is "one billion, six hundred sixty-six million, one hundred ninety-eight thousand, one hundred fifty-six".