6656599620 has 216 divisors, whose sum is σ = 22912431360. Its totient is φ = 1561507200.

The previous prime is 6656599619. The next prime is 6656599633. The reversal of 6656599620 is 269956566.

6656599620 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 5 + 9 + 9 + 620 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 670251 + ... + 680109.

Almost surely, 2^6656599620 is an apocalyptic number.

6656599620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6656599620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11456215680).

6656599620 is an abundant number, since it is smaller than the sum of its proper divisors (16255831740).

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

6656599620 is a wasteful number, since it uses less digits than its factorization.

6656599620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9927 (or 9911 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The square root of 6656599620 is about 81587.9869833789. The cubic root of 6656599620 is about 1881.1242351513.

The spelling of 6656599620 in words is "six billion, six hundred fifty-six million, five hundred ninety-nine thousand, six hundred twenty".