18525601181 has 2 divisors, whose sum is σ = 18525601182. Its totient is φ = 18525601180.

The previous prime is 18525601121. The next prime is 18525601187. The reversal of 18525601181 is 18110652581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9630281956 + 8895319225 = 98134^2 + 94315^2 .

It is a cyclic number.

It is not a de Polignac number, because 18525601181 - 2²⁶ = 18458492317 is a prime.

It is a super-2 number, since 2×18525601181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18525601187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9262800590 + 9262800591.

It is an arithmetic number, because the mean of its divisors is an integer number (9262800591).

Almost surely, 2^18525601181 is an apocalyptic number.

It is an amenable number.

18525601181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18525601181 is an equidigital number, since it uses as much as digits as its factorization.

18525601181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 38.

The spelling of 18525601181 in words is "eighteen billion, five hundred twenty-five million, six hundred one thousand, one hundred eighty-one".