238158634985261 has 2 divisors, whose sum is σ = 238158634985262. Its totient is φ = 238158634985260.

The previous prime is 238158634985197. The next prime is 238158634985437. The reversal of 238158634985261 is 162589436851832.

238158634985261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121432002905161 + 116726632080100 = 11019619^2 + 10804010^2 .

It is a cyclic number.

It is not a de Polignac number, because 238158634985261 - 2⁶ = 238158634985197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238158634981261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119079317492630 + 119079317492631.

It is an arithmetic number, because the mean of its divisors is an integer number (119079317492631).

Almost surely, 2^{238158634985261} is an apocalyptic number.

It is an amenable number.

238158634985261 is a deficient number, since it is larger than the sum of its proper divisors (1).

238158634985261 is an equidigital number, since it uses as much as digits as its factorization.

238158634985261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 597196800, while the sum is 71.

The spelling of 238158634985261 in words is "two hundred thirty-eight trillion, one hundred fifty-eight billion, six hundred thirty-four million, nine hundred eighty-five thousand, two hundred sixty-one".