6620012100 has 108 divisors (see below), whose sum is σ = 22346258116. Its totient is φ = 1629538560.

The previous prime is 6620012089. The next prime is 6620012101. The reversal of 6620012100 is 12100266.

It is a happy number.

6620012100 is a `hidden beast` number, since 662 + 0 + 0 + 1 + 2 + 1 + 0 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1759970304 + 4860041796 = 41952^2 + 69714^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (6620012101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 271207 + ... + 294606.

Almost surely, 2^6620012100 is an apocalyptic number.

6620012100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6620012100 is an abundant number, since it is smaller than the sum of its proper divisors (15726246016).

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

6620012100 is a wasteful number, since it uses less digits than its factorization.

6620012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565846 (or 565836 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 6620012100 is about 81363.4567849720. The cubic root of 6620012100 is about 1877.6714134193.

Adding to 6620012100 its reverse (12100266), we get a palindrome (6632112366).

The spelling of 6620012100 in words is "six billion, six hundred twenty million, twelve thousand, one hundred".