8944017561 has 6 divisors (see below), whose sum is σ = 12919136490. Its totient is φ = 5962678368.

The previous prime is 8944017559. The next prime is 8944017653. The reversal of 8944017561 is 1657104498.

8944017561 is a `hidden beast` number, since 89 + 4 + 4 + 0 + 1 + 7 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8511169536 + 432848025 = 92256^2 + 20805^2 .

It is not a de Polignac number, because 8944017561 - 2¹ = 8944017559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8944017361) 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, 496889856 + ... + 496889873.

It is an arithmetic number, because the mean of its divisors is an integer number (2153189415).

Almost surely, 2^8944017561 is an apocalyptic number.

It is an amenable number.

8944017561 is a deficient number, since it is larger than the sum of its proper divisors (3975118929).

8944017561 is a wasteful number, since it uses less digits than its factorization.

8944017561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993779735 (or 993779732 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 8944017561 is about 94572.8161841446. The cubic root of 8944017561 is about 2075.7619545347.

The spelling of 8944017561 in words is "eight billion, nine hundred forty-four million, seventeen thousand, five hundred sixty-one".