18010634557 has 2 divisors, whose sum is σ = 18010634558. Its totient is φ = 18010634556.

The previous prime is 18010634531. The next prime is 18010634569. The reversal of 18010634557 is 75543601081.

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., 11238332121 + 6772302436 = 106011^2 + 82294^2 .

It is a cyclic number.

It is not a de Polignac number, because 18010634557 - 2³¹ = 15863150909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18010634597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005317278 + 9005317279.

It is an arithmetic number, because the mean of its divisors is an integer number (9005317279).

Almost surely, 2^18010634557 is an apocalyptic number.

It is an amenable number.

18010634557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010634557 is an equidigital number, since it uses as much as digits as its factorization.

18010634557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 18010634557 in words is "eighteen billion, ten million, six hundred thirty-four thousand, five hundred fifty-seven".