18777705819 has 8 divisors (see below), whose sum is σ = 25619195712. Its totient is φ = 12227343240.

The previous prime is 18777705781. The next prime is 18777705887. The reversal of 18777705819 is 91850777781.

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

It is not a de Polignac number, because 18777705819 - 2³³ = 10187771227 is a prime.

It is a super-2 number, since 2×18777705819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18777705019) 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, 72781677 + ... + 72781934.

It is an arithmetic number, because the mean of its divisors is an integer number (3202399464).

Almost surely, 2^18777705819 is an apocalyptic number.

18777705819 is a deficient number, since it is larger than the sum of its proper divisors (6841489893).

18777705819 is a wasteful number, since it uses less digits than its factorization.

18777705819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145563657.

The product of its (nonzero) digits is 6914880, while the sum is 60.

The spelling of 18777705819 in words is "eighteen billion, seven hundred seventy-seven million, seven hundred five thousand, eight hundred nineteen".