4118781817 has 2 divisors, whose sum is σ = 4118781818. Its totient is φ = 4118781816.

The previous prime is 4118781773. The next prime is 4118781827. The reversal of 4118781817 is 7181878114.

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., 4101633936 + 17147881 = 64044^2 + 4141^2 .

It is a cyclic number.

It is not a de Polignac number, because 4118781817 - 2¹⁹ = 4118257529 is a prime.

It is not a weakly prime, because it can be changed into another prime (4118781827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2059390908 + 2059390909.

It is an arithmetic number, because the mean of its divisors is an integer number (2059390909).

Almost surely, 2^4118781817 is an apocalyptic number.

It is an amenable number.

4118781817 is a deficient number, since it is larger than the sum of its proper divisors (1).

4118781817 is an equidigital number, since it uses as much as digits as its factorization.

4118781817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 46.

The square root of 4118781817 is about 64177.7361473588. The cubic root of 4118781817 is about 1602.9608997125.

The spelling of 4118781817 in words is "four billion, one hundred eighteen million, seven hundred eighty-one thousand, eight hundred seventeen".