23538478181 has 2 divisors, whose sum is σ = 23538478182. Its totient is φ = 23538478180.

The previous prime is 23538478153. The next prime is 23538478193. The reversal of 23538478181 is 18187483532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16858685281 + 6679792900 = 129841^2 + 81730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23538478181 is a prime.

It is a super-2 number, since 2×23538478181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23538474181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11769239090 + 11769239091.

It is an arithmetic number, because the mean of its divisors is an integer number (11769239091).

Almost surely, 2^23538478181 is an apocalyptic number.

It is an amenable number.

23538478181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23538478181 is an equidigital number, since it uses as much as digits as its factorization.

23538478181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The spelling of 23538478181 in words is "twenty-three billion, five hundred thirty-eight million, four hundred seventy-eight thousand, one hundred eighty-one".