18877677881 has 4 divisors (see below), whose sum is σ = 19486635264. Its totient is φ = 18268720500.

The previous prime is 18877677857. The next prime is 18877677893.

It is a happy number.

18877677881 is nontrivially palindromic in base 10.

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 18877677881 - 2²⁶ = 18810569017 is a prime.

It is a super-2 number, since 2×18877677881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18877677821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304478645 + ... + 304478706.

It is an arithmetic number, because the mean of its divisors is an integer number (4871658816).

Almost surely, 2^18877677881 is an apocalyptic number.

It is an amenable number.

18877677881 is a deficient number, since it is larger than the sum of its proper divisors (608957383).

18877677881 is an equidigital number, since it uses as much as digits as its factorization.

18877677881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608957382.

The product of its digits is 59006976, while the sum is 68.

The spelling of 18877677881 in words is "eighteen billion, eight hundred seventy-seven million, six hundred seventy-seven thousand, eight hundred eighty-one".