18957440113 has 2 divisors, whose sum is σ = 18957440114. Its totient is φ = 18957440112.

The previous prime is 18957440101. The next prime is 18957440179. The reversal of 18957440113 is 31104475981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14335751824 + 4621688289 = 119732^2 + 67983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18957440113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18957440113.

It is not a weakly prime, because it can be changed into another prime (18957440713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9478720056 + 9478720057.

It is an arithmetic number, because the mean of its divisors is an integer number (9478720057).

Almost surely, 2^18957440113 is an apocalyptic number.

It is an amenable number.

18957440113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18957440113 is an equidigital number, since it uses as much as digits as its factorization.

18957440113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 18957440113 in words is "eighteen billion, nine hundred fifty-seven million, four hundred forty thousand, one hundred thirteen".