9018978561 has 8 divisors (see below), whose sum is σ = 13361449760. Its totient is φ = 6012652356.

The previous prime is 9018978559. The next prime is 9018978581. The reversal of 9018978561 is 1658798109.

9018978561 is a `hidden beast` number, since 9 + 0 + 1 + 8 + 9 + 78 + 561 = 666.

9018978561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9018978561 - 2¹ = 9018978559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9018978498 and 9018978507.

It is not an unprimeable number, because it can be changed into a prime (9018978581) 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, 167018095 + ... + 167018148.

It is an arithmetic number, because the mean of its divisors is an integer number (1670181220).

Almost surely, 2^9018978561 is an apocalyptic number.

It is an amenable number.

9018978561 is a deficient number, since it is larger than the sum of its proper divisors (4342471199).

9018978561 is a wasteful number, since it uses less digits than its factorization.

9018978561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334036252 (or 334036246 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The square root of 9018978561 is about 94968.3029278717. The cubic root of 9018978561 is about 2081.5449075489.

The spelling of 9018978561 in words is "nine billion, eighteen million, nine hundred seventy-eight thousand, five hundred sixty-one".