18906418877 has 2 divisors, whose sum is σ = 18906418878. Its totient is φ = 18906418876.

The previous prime is 18906418871. The next prime is 18906418889. The reversal of 18906418877 is 77881460981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15890871481 + 3015547396 = 126059^2 + 54914^2 .

It is a cyclic number.

It is not a de Polignac number, because 18906418877 - 2¹⁰ = 18906417853 is a prime.

It is a super-2 number, since 2×18906418877² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18906418871) 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, 9453209438 + 9453209439.

It is an arithmetic number, because the mean of its divisors is an integer number (9453209439).

Almost surely, 2^18906418877 is an apocalyptic number.

It is an amenable number.

18906418877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18906418877 is an equidigital number, since it uses as much as digits as its factorization.

18906418877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 18906418877 in words is "eighteen billion, nine hundred six million, four hundred eighteen thousand, eight hundred seventy-seven".