6665921100 has 54 divisors (see below), whose sum is σ = 20893962180. Its totient is φ = 1777578720.

The previous prime is 6665921099. The next prime is 6665921137. The reversal of 6665921100 is 11295666.

It is a super-2 number, since 2×6665921100² = 88869008222850420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3702390 + ... + 3704189.

Almost surely, 2^6665921100 is an apocalyptic number.

6665921100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6665921100 is an abundant number, since it is smaller than the sum of its proper divisors (14228041080).

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

6665921100 is a wasteful number, since it uses less digits than its factorization.

6665921100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406599 (or 7406589 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 6665921100 is about 81645.0923203593. The cubic root of 6665921100 is about 1882.0018946369.

The spelling of 6665921100 in words is "six billion, six hundred sixty-five million, nine hundred twenty-one thousand, one hundred".