18005796579977 has 4 divisors (see below), whose sum is σ = 18015872573136. Its totient is φ = 17995720586820.

The previous prime is 18005796579961. The next prime is 18005796579997. The reversal of 18005796579977 is 77997569750081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18005796579977 - 2⁴ = 18005796579961 is a prime.

It is a super-2 number, since 2×18005796579977² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18005796579907) 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 3 ways as a sum of consecutive naturals, for example, 5037993899 + ... + 5037997472.

It is an arithmetic number, because the mean of its divisors is an integer number (4503968143284).

Almost surely, 2^{18005796579977} is an apocalyptic number.

It is an amenable number.

18005796579977 is a deficient number, since it is larger than the sum of its proper divisors (10075993159).

18005796579977 is a wasteful number, since it uses less digits than its factorization.

18005796579977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10075993158.

The product of its (nonzero) digits is 2100394800, while the sum is 80.

The spelling of 18005796579977 in words is "eighteen trillion, five billion, seven hundred ninety-six million, five hundred seventy-nine thousand, nine hundred seventy-seven".