18776136949 has 2 divisors, whose sum is σ = 18776136950. Its totient is φ = 18776136948.

The previous prime is 18776136937. The next prime is 18776136961. The reversal of 18776136949 is 94963167781.

It is a balanced prime because it is at equal distance from previous prime (18776136937) and next prime (18776136961).

It can be written as a sum of positive squares in only one way, i.e., 15922654225 + 2853482724 = 126185^2 + 53418^2 .

It is a cyclic number.

It is not a de Polignac number, because 18776136949 - 2¹⁵ = 18776104181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18776136979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9388068474 + 9388068475.

It is an arithmetic number, because the mean of its divisors is an integer number (9388068475).

Almost surely, 2^18776136949 is an apocalyptic number.

It is an amenable number.

18776136949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18776136949 is an equidigital number, since it uses as much as digits as its factorization.

18776136949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The spelling of 18776136949 in words is "eighteen billion, seven hundred seventy-six million, one hundred thirty-six thousand, nine hundred forty-nine".