8043621561 has 6 divisors (see below), whose sum is σ = 11618564490. Its totient is φ = 5362414368.

The previous prime is 8043621527. The next prime is 8043621563. The reversal of 8043621561 is 1651263408.

It is a happy number.

8043621561 is a `hidden beast` number, since 8 + 0 + 436 + 215 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5704931961 + 2338689600 = 75531^2 + 48360^2 .

It is not a de Polignac number, because 8043621561 - 2⁶ = 8043621497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8043621563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 446867856 + ... + 446867873.

It is an arithmetic number, because the mean of its divisors is an integer number (1936427415).

Almost surely, 2^8043621561 is an apocalyptic number.

It is an amenable number.

8043621561 is a deficient number, since it is larger than the sum of its proper divisors (3574942929).

8043621561 is a wasteful number, since it uses less digits than its factorization.

8043621561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893735735 (or 893735732 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 8043621561 is about 89686.2395298186. The cubic root of 8043621561 is about 2003.6285429402.

Adding to 8043621561 its reverse (1651263408), we get a palindrome (9694884969).

The spelling of 8043621561 in words is "eight billion, forty-three million, six hundred twenty-one thousand, five hundred sixty-one".