18555145562 has 4 divisors (see below), whose sum is σ = 27832718346. Its totient is φ = 9277572780.

The previous prime is 18555145547. The next prime is 18555145579. The reversal of 18555145562 is 26554155581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26554155581 = 1601 ⋅16585981.

It can be written as a sum of positive squares in only one way, i.e., 15744979441 + 2810166121 = 125479^2 + 53011^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4638786389 + ... + 4638786392.

Almost surely, 2^18555145562 is an apocalyptic number.

18555145562 is a deficient number, since it is larger than the sum of its proper divisors (9277572784).

18555145562 is an equidigital number, since it uses as much as digits as its factorization.

18555145562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9277572783.

The product of its digits is 1200000, while the sum is 47.

The spelling of 18555145562 in words is "eighteen billion, five hundred fifty-five million, one hundred forty-five thousand, five hundred sixty-two".