18025652081 has 4 divisors (see below), whose sum is σ = 18046686372. Its totient is φ = 18004617792.

The previous prime is 18025651979. The next prime is 18025652107.

18025652081 is nontrivially palindromic in base 10.

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 17220000625 + 805651456 = 131225^2 + 28384^2 .

It is a cyclic number.

It is not a de Polignac number, because 18025652081 - 2¹⁴ = 18025635697 is a prime.

It is a super-2 number, since 2×18025652081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18025652681) 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, 10515860 + ... + 10517573.

It is an arithmetic number, because the mean of its divisors is an integer number (4511671593).

Almost surely, 2^18025652081 is an apocalyptic number.

It is an amenable number.

18025652081 is a deficient number, since it is larger than the sum of its proper divisors (21034291).

18025652081 is an equidigital number, since it uses as much as digits as its factorization.

18025652081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21034290.

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 18025652081 in words is "eighteen billion, twenty-five million, six hundred fifty-two thousand, eighty-one".