18877277827 has 2 divisors, whose sum is σ = 18877277828. Its totient is φ = 18877277826.

The previous prime is 18877277801. The next prime is 18877277891. The reversal of 18877277827 is 72877277881.

It is a happy number.

It is an a-pointer prime, because the next prime (18877277891) can be obtained adding 18877277827 to its sum of digits (64).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18877277827 is a prime.

It is not a weakly prime, because it can be changed into another prime (18877277897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9438638913 + 9438638914.

It is an arithmetic number, because the mean of its divisors is an integer number (9438638914).

Almost surely, 2^18877277827 is an apocalyptic number.

18877277827 is a deficient number, since it is larger than the sum of its proper divisors (1).

18877277827 is an equidigital number, since it uses as much as digits as its factorization.

18877277827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34420736, while the sum is 64.

The spelling of 18877277827 in words is "eighteen billion, eight hundred seventy-seven million, two hundred seventy-seven thousand, eight hundred twenty-seven".