18425396081 has 2 divisors, whose sum is σ = 18425396082. Its totient is φ = 18425396080.

The previous prime is 18425396027. The next prime is 18425396083. The reversal of 18425396081 is 18069352481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17727591025 + 697805056 = 133145^2 + 26416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18425396081 is a prime.

It is a super-2 number, since 2×18425396081² (a number of 21 digits) contains 22 as substring.

Together with 18425396083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18425396083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212698040 + 9212698041.

It is an arithmetic number, because the mean of its divisors is an integer number (9212698041).

Almost surely, 2^18425396081 is an apocalyptic number.

It is an amenable number.

18425396081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18425396081 is an equidigital number, since it uses as much as digits as its factorization.

18425396081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 18425396081 in words is "eighteen billion, four hundred twenty-five million, three hundred ninety-six thousand, eighty-one".