618475290649 has 2 divisors, whose sum is σ = 618475290650. Its totient is φ = 618475290648.

The previous prime is 618475290607. The next prime is 618475290659. The reversal of 618475290649 is 946092574816.

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., 618475290624 + 25 = 786432^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618475290649 is a prime.

It is not a weakly prime, because it can be changed into another prime (618475290659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309237645324 + 309237645325.

It is an arithmetic number, because the mean of its divisors is an integer number (309237645325).

Almost surely, 2^618475290649 is an apocalyptic number.

It is an amenable number.

618475290649 is a deficient number, since it is larger than the sum of its proper divisors (1).

618475290649 is an equidigital number, since it uses as much as digits as its factorization.

618475290649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 618475290649 in words is "six hundred eighteen billion, four hundred seventy-five million, two hundred ninety thousand, six hundred forty-nine".