238542685517 has 2 divisors, whose sum is σ = 238542685518. Its totient is φ = 238542685516.

The previous prime is 238542685501. The next prime is 238542685531. The reversal of 238542685517 is 715586245832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234129209161 + 4413476356 = 483869^2 + 66434^2 .

It is a cyclic number.

It is not a de Polignac number, because 238542685517 - 2⁴ = 238542685501 is a prime.

It is a super-2 number, since 2×238542685517² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238542685547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119271342758 + 119271342759.

It is an arithmetic number, because the mean of its divisors is an integer number (119271342759).

Almost surely, 2^238542685517 is an apocalyptic number.

It is an amenable number.

238542685517 is a deficient number, since it is larger than the sum of its proper divisors (1).

238542685517 is an equidigital number, since it uses as much as digits as its factorization.

238542685517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128000, while the sum is 56.

The spelling of 238542685517 in words is "two hundred thirty-eight billion, five hundred forty-two million, six hundred eighty-five thousand, five hundred seventeen".