18977560805 has 32 divisors (see below), whose sum is σ = 26579798784. Its totient is φ = 12737627136.

The previous prime is 18977560801. The next prime is 18977560871. The reversal of 18977560805 is 50806577981.

It is a cyclic number.

It is not a de Polignac number, because 18977560805 - 2² = 18977560801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18977560801) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 791402 + ... + 815028.

It is an arithmetic number, because the mean of its divisors is an integer number (830618712).

Almost surely, 2^18977560805 is an apocalyptic number.

It is an amenable number.

18977560805 is a deficient number, since it is larger than the sum of its proper divisors (7602237979).

18977560805 is a wasteful number, since it uses less digits than its factorization.

18977560805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24125.

The product of its (nonzero) digits is 4233600, while the sum is 56.

The spelling of 18977560805 in words is "eighteen billion, nine hundred seventy-seven million, five hundred sixty thousand, eight hundred five".