18581442779 has 8 divisors (see below), whose sum is σ = 18616117200. Its totient is φ = 18546796800.

The previous prime is 18581442769. The next prime is 18581442821. The reversal of 18581442779 is 97724418581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18581442779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18581442739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1638872 + ... + 1650170.

It is an arithmetic number, because the mean of its divisors is an integer number (2327014650).

Almost surely, 2^18581442779 is an apocalyptic number.

18581442779 is a deficient number, since it is larger than the sum of its proper divisors (34674421).

18581442779 is a wasteful number, since it uses less digits than its factorization.

18581442779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14221.

The product of its digits is 4515840, while the sum is 56.

The spelling of 18581442779 in words is "eighteen billion, five hundred eighty-one million, four hundred forty-two thousand, seven hundred seventy-nine".