18555141386 has 4 divisors (see below), whose sum is σ = 27832712082. Its totient is φ = 9277570692.

The previous prime is 18555141361. The next prime is 18555141389. The reversal of 18555141386 is 68314155581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68314155581 = 7 ⋅9759165083.

It can be written as a sum of positive squares in only one way, i.e., 16996076161 + 1559065225 = 130369^2 + 39485^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18555141386.

It is not an unprimeable number, because it can be changed into a prime (18555141389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4638785345 + ... + 4638785348.

Almost surely, 2^18555141386 is an apocalyptic number.

18555141386 is a deficient number, since it is larger than the sum of its proper divisors (9277570696).

18555141386 is an equidigital number, since it uses as much as digits as its factorization.

18555141386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277570695.

The product of its digits is 576000, while the sum is 47.

The spelling of 18555141386 in words is "eighteen billion, five hundred fifty-five million, one hundred forty-one thousand, three hundred eighty-six".