238671583561 has 4 divisors (see below), whose sum is σ = 239661922324. Its totient is φ = 237681244800.

The previous prime is 238671583523. The next prime is 238671583597. The reversal of 238671583561 is 165385176832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107178319161 + 131493264400 = 327381^2 + 362620^2 .

It is a cyclic number.

It is not a de Polignac number, because 238671583561 - 2⁹ = 238671583049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238671583361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495169020 + ... + 495169501.

It is an arithmetic number, because the mean of its divisors is an integer number (59915480581).

Almost surely, 2^238671583561 is an apocalyptic number.

It is an amenable number.

238671583561 is a deficient number, since it is larger than the sum of its proper divisors (990338763).

238671583561 is an equidigital number, since it uses as much as digits as its factorization.

238671583561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990338762.

The product of its digits is 7257600, while the sum is 55.

The spelling of 238671583561 in words is "two hundred thirty-eight billion, six hundred seventy-one million, five hundred eighty-three thousand, five hundred sixty-one".