18549177859 has 2 divisors, whose sum is σ = 18549177860. Its totient is φ = 18549177858.

The previous prime is 18549177781. The next prime is 18549177877. The reversal of 18549177859 is 95877194581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18549177859 - 2¹¹ = 18549175811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18549177859.

It is not a weakly prime, because it can be changed into another prime (18549177359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274588929 + 9274588930.

It is an arithmetic number, because the mean of its divisors is an integer number (9274588930).

Almost surely, 2^18549177859 is an apocalyptic number.

18549177859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18549177859 is an equidigital number, since it uses as much as digits as its factorization.

18549177859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25401600, while the sum is 64.

The spelling of 18549177859 in words is "eighteen billion, five hundred forty-nine million, one hundred seventy-seven thousand, eight hundred fifty-nine".