290538789561 has 12 divisors (see below), whose sum is σ = 444353443092. Its totient is φ = 182298848256.

The previous prime is 290538789559. The next prime is 290538789613. The reversal of 290538789561 is 165987835092.

290538789561 is a `hidden beast` number, since 2 + 9 + 0 + 538 + 7 + 8 + 95 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 245762113536 + 44776676025 = 495744^2 + 211605^2 .

It is not a de Polignac number, because 290538789561 - 2¹ = 290538789559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (290538785561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 949473016 + ... + 949473321.

It is an arithmetic number, because the mean of its divisors is an integer number (37029453591).

Almost surely, 2^290538789561 is an apocalyptic number.

It is an amenable number.

290538789561 is a deficient number, since it is larger than the sum of its proper divisors (153814653531).

290538789561 is a wasteful number, since it uses less digits than its factorization.

290538789561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898946360 (or 1898946357 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 63.

The spelling of 290538789561 in words is "two hundred ninety billion, five hundred thirty-eight million, seven hundred eighty-nine thousand, five hundred sixty-one".