618988138841 has 2 divisors, whose sum is σ = 618988138842. Its totient is φ = 618988138840.

The previous prime is 618988138837. The next prime is 618988138897. The reversal of 618988138841 is 148831889816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459311175625 + 159676963216 = 677725^2 + 399596^2 .

It is a cyclic number.

It is not a de Polignac number, because 618988138841 - 2² = 618988138837 is a prime.

It is not a weakly prime, because it can be changed into another prime (618988138801) 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, 309494069420 + 309494069421.

It is an arithmetic number, because the mean of its divisors is an integer number (309494069421).

Almost surely, 2^618988138841 is an apocalyptic number.

It is an amenable number.

618988138841 is a deficient number, since it is larger than the sum of its proper divisors (1).

618988138841 is an equidigital number, since it uses as much as digits as its factorization.

618988138841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21233664, while the sum is 65.

The spelling of 618988138841 in words is "six hundred eighteen billion, nine hundred eighty-eight million, one hundred thirty-eight thousand, eight hundred forty-one".