6651551808 has 168 divisors, whose sum is σ = 20860609536. Its totient is φ = 2009625600.

The previous prime is 6651551789. The next prime is 6651551833. The reversal of 6651551808 is 8081551566.

6651551808 is a `hidden beast` number, since 6 + 6 + 515 + 51 + 80 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2425318 + ... + 2428058.

Almost surely, 2^6651551808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6651551808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10430304768).

6651551808 is an abundant number, since it is smaller than the sum of its proper divisors (14209057728).

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

6651551808 is a wasteful number, since it uses less digits than its factorization.

6651551808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153 (or 3140 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The square root of 6651551808 is about 81557.0463418091. The cubic root of 6651551808 is about 1880.6486188078.

The spelling of 6651551808 in words is "six billion, six hundred fifty-one million, five hundred fifty-one thousand, eight hundred eight".