6621808144 has 40 divisors (see below), whose sum is σ = 14696702208. Its totient is φ = 2831312640.

The previous prime is 6621808133. The next prime is 6621808153. The reversal of 6621808144 is 4418081266.

It is a junction number, because it is equal to n+sod(n) for n = 6621808097 and 6621808106.

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, 20317 + ... + 116860.

Almost surely, 2^6621808144 is an apocalyptic number.

It is an amenable number.

6621808144 is an abundant number, since it is smaller than the sum of its proper divisors (8074894064).

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

6621808144 is a wasteful number, since it uses less digits than its factorization.

6621808144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137623 (or 137617 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 6621808144 is about 81374.4932027229. The cubic root of 6621808144 is about 1877.8412054322.

The spelling of 6621808144 in words is "six billion, six hundred twenty-one million, eight hundred eight thousand, one hundred forty-four".