18555361977 has 16 divisors (see below), whose sum is σ = 26199821952. Its totient is φ = 11640794880.

The previous prime is 18555361949. The next prime is 18555362009. The reversal of 18555361977 is 77916355581.

It is a happy number.

It is not a de Polignac number, because 18555361977 - 2²³ = 18546973369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18555361907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360468 + ... + 408714.

It is an arithmetic number, because the mean of its divisors is an integer number (1637488872).

Almost surely, 2^18555361977 is an apocalyptic number.

18555361977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18555361977 is a deficient number, since it is larger than the sum of its proper divisors (7644459975).

18555361977 is a wasteful number, since it uses less digits than its factorization.

18555361977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55808.

The product of its digits is 7938000, while the sum is 57.

The spelling of 18555361977 in words is "eighteen billion, five hundred fifty-five million, three hundred sixty-one thousand, nine hundred seventy-seven".