6651205020 has 36 divisors (see below), whose sum is σ = 20175322440. Its totient is φ = 1773654624.

The previous prime is 6651204997. The next prime is 6651205061. The reversal of 6651205020 is 205021566.

6651205020 is a `hidden beast` number, since 6 + 651 + 2 + 0 + 5 + 0 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18475390 + ... + 18475749.

Almost surely, 2^6651205020 is an apocalyptic number.

6651205020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6651205020 is an abundant number, since it is smaller than the sum of its proper divisors (13524117420).

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

6651205020 is a wasteful number, since it uses less digits than its factorization.

6651205020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36951154 (or 36951149 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6651205020 is about 81554.9202684915. The cubic root of 6651205020 is about 1880.6159348204.

Adding to 6651205020 its reverse (205021566), we get a palindrome (6856226586).

The spelling of 6651205020 in words is "six billion, six hundred fifty-one million, two hundred five thousand, twenty".