1666526616 has 32 divisors (see below), whose sum is σ = 4629241200. Its totient is φ = 555508800.

The previous prime is 1666526593. The next prime is 1666526621. The reversal of 1666526616 is 6166256661.

It is a super-2 number, since 2×1666526616² = 5554621923672822912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3857485 + ... + 3857916.

Almost surely, 2^1666526616 is an apocalyptic number.

It is an amenable number.

1666526616 is an abundant number, since it is smaller than the sum of its proper divisors (2962714584).

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

1666526616 is a wasteful number, since it uses less digits than its factorization.

1666526616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715416 (or 7715406 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1666526616 is about 40823.1137469939. The cubic root of 1666526616 is about 1185.5978908812.

The spelling of 1666526616 in words is "one billion, six hundred sixty-six million, five hundred twenty-six thousand, six hundred sixteen".