6656000421 has 32 divisors (see below), whose sum is σ = 10641350656. Its totient is φ = 3620376000.

The previous prime is 6656000387. The next prime is 6656000441. The reversal of 6656000421 is 1240006566.

It is not a de Polignac number, because 6656000421 - 2⁶ = 6656000357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656000441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44095 + ... + 123516.

It is an arithmetic number, because the mean of its divisors is an integer number (332542208).

Almost surely, 2^6656000421 is an apocalyptic number.

6656000421 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6656000421 is a deficient number, since it is larger than the sum of its proper divisors (3985350235).

6656000421 is a wasteful number, since it uses less digits than its factorization.

6656000421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167713.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6656000421 is about 81584.3147976374. The cubic root of 6656000421 is about 1881.0677898365.

Adding to 6656000421 its reverse (1240006566), we get a palindrome (7896006987).

The spelling of 6656000421 in words is "six billion, six hundred fifty-six million, four hundred twenty-one", and thus it is an aban number.