6621909396 has 48 divisors (see below), whose sum is σ = 15537622464. Its totient is φ = 2194972416.

The previous prime is 6621909373. The next prime is 6621909401. The reversal of 6621909396 is 6939091266.

It is a happy number.

It is a hoax number, since the sum of its digits (51) 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 15 ways as a sum of consecutive naturals, for example, 4145670 + ... + 4147266.

It is an arithmetic number, because the mean of its divisors is an integer number (323700468).

Almost surely, 2^6621909396 is an apocalyptic number.

It is an amenable number.

6621909396 is an abundant number, since it is smaller than the sum of its proper divisors (8915713068).

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

6621909396 is a wasteful number, since it uses less digits than its factorization.

6621909396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320 (or 3318 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 51.

The square root of 6621909396 is about 81375.1153363238. The cubic root of 6621909396 is about 1877.8507765445.

The spelling of 6621909396 in words is "six billion, six hundred twenty-one million, nine hundred nine thousand, three hundred ninety-six".