618778793 has 2 divisors, whose sum is σ = 618778794. Its totient is φ = 618778792.

The previous prime is 618778747. The next prime is 618778813. The reversal of 618778793 is 397877816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618616384 + 162409 = 24872^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 618778793 - 2¹² = 618774697 is a prime.

It is not a weakly prime, because it can be changed into another prime (618778093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309389396 + 309389397.

It is an arithmetic number, because the mean of its divisors is an integer number (309389397).

Almost surely, 2^618778793 is an apocalyptic number.

It is an amenable number.

618778793 is a deficient number, since it is larger than the sum of its proper divisors (1).

618778793 is an equidigital number, since it uses as much as digits as its factorization.

618778793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 56.

The square root of 618778793 is about 24875.2646820089. The cubic root of 618778793 is about 852.1416779131.

The spelling of 618778793 in words is "six hundred eighteen million, seven hundred seventy-eight thousand, seven hundred ninety-three".