18756216877 has 2 divisors, whose sum is σ = 18756216878. Its totient is φ = 18756216876.

The previous prime is 18756216863. The next prime is 18756216901. The reversal of 18756216877 is 77861265781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17768623401 + 987593476 = 133299^2 + 31426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18756216877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18756216077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9378108438 + 9378108439.

It is an arithmetic number, because the mean of its divisors is an integer number (9378108439).

Almost surely, 2^18756216877 is an apocalyptic number.

It is an amenable number.

18756216877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18756216877 is an equidigital number, since it uses as much as digits as its factorization.

18756216877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 58.

The spelling of 18756216877 in words is "eighteen billion, seven hundred fifty-six million, two hundred sixteen thousand, eight hundred seventy-seven".