2166525556 has 12 divisors (see below), whose sum is σ = 4083067492. Its totient is φ = 999934848.

The previous prime is 2166525541. The next prime is 2166525563. The reversal of 2166525556 is 6555256612.

It can be written as a sum of positive squares in 2 ways, for example, as 146023056 + 2020502500 = 12084^2 + 44950^2 .

It is a super-2 number, since 2×2166525556² = 9387665969602218272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20831925 + ... + 20832028.

Almost surely, 2^2166525556 is an apocalyptic number.

2166525556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2166525556 is a deficient number, since it is larger than the sum of its proper divisors (1916541936).

2166525556 is a wasteful number, since it uses less digits than its factorization.

2166525556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41663970 (or 41663968 counting only the distinct ones).

The product of its digits is 540000, while the sum is 43.

The square root of 2166525556 is about 46545.9510161733. The cubic root of 2166525556 is about 1293.9612538535.

The spelling of 2166525556 in words is "two billion, one hundred sixty-six million, five hundred twenty-five thousand, five hundred fifty-six".