6550021556 has 24 divisors (see below), whose sum is σ = 12417331080. Its totient is φ = 3023082816.

The previous prime is 6550021553. The next prime is 6550021561. The reversal of 6550021556 is 6551200556.

It can be written as a sum of positive squares in 4 ways, for example, as 1749748900 + 4800272656 = 41830^2 + 69284^2 .

It is a super-2 number, since 2×6550021556² = 85805564768129322272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550021553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363881 + ... + 381456.

It is an arithmetic number, because the mean of its divisors is an integer number (517388795).

Almost surely, 2^6550021556 is an apocalyptic number.

It is an amenable number.

6550021556 is a deficient number, since it is larger than the sum of its proper divisors (5867309524).

6550021556 is a wasteful number, since it uses less digits than its factorization.

6550021556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745380 (or 745352 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 6550021556 is about 80932.2034544964. The cubic root of 6550021556 is about 1871.0306838772.

The spelling of 6550021556 in words is "six billion, five hundred fifty million, twenty-one thousand, five hundred fifty-six".