6550621820 has 12 divisors (see below), whose sum is σ = 13756305864. Its totient is φ = 2620248720.

The previous prime is 6550621807. The next prime is 6550621829. The reversal of 6550621820 is 281260556.

It is a super-2 number, since 2×6550621820² = 85821292457320224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550621829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163765526 + ... + 163765565.

It is an arithmetic number, because the mean of its divisors is an integer number (1146358822).

Almost surely, 2^6550621820 is an apocalyptic number.

It is an amenable number.

6550621820 is an abundant number, since it is smaller than the sum of its proper divisors (7205684044).

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

6550621820 is a wasteful number, since it uses less digits than its factorization.

6550621820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327531100 (or 327531098 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 6550621820 is about 80935.9118068117. The cubic root of 6550621820 is about 1871.0878377886.

The spelling of 6550621820 in words is "six billion, five hundred fifty million, six hundred twenty-one thousand, eight hundred twenty".