18551068477 has 2 divisors, whose sum is σ = 18551068478. Its totient is φ = 18551068476.

The previous prime is 18551068433. The next prime is 18551068499. The reversal of 18551068477 is 77486015581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16389376441 + 2161692036 = 128021^2 + 46494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18551068477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18551063477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9275534238 + 9275534239.

It is an arithmetic number, because the mean of its divisors is an integer number (9275534239).

Almost surely, 2^18551068477 is an apocalyptic number.

It is an amenable number.

18551068477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18551068477 is an equidigital number, since it uses as much as digits as its factorization.

18551068477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 18551068477 in words is "eighteen billion, five hundred fifty-one million, sixty-eight thousand, four hundred seventy-seven".