8551021636 has 6 divisors (see below), whose sum is σ = 14964287870. Its totient is φ = 4275510816.

The previous prime is 8551021613. The next prime is 8551021639. The reversal of 8551021636 is 6361201558.

It can be written as a sum of positive squares in only one way, i.e., 7778181636 + 772840000 = 88194^2 + 27800^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8551021595 and 8551021604.

It is not an unprimeable number, because it can be changed into a prime (8551021639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1068877701 + ... + 1068877708.

Almost surely, 2^8551021636 is an apocalyptic number.

It is an amenable number.

8551021636 is a deficient number, since it is larger than the sum of its proper divisors (6413266234).

8551021636 is a wasteful number, since it uses less digits than its factorization.

8551021636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137755413 (or 2137755411 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 8551021636 is about 92471.7342543115. The cubic root of 8551021636 is about 2044.9027945419.

The spelling of 8551021636 in words is "eight billion, five hundred fifty-one million, twenty-one thousand, six hundred thirty-six".